Strapless Prom Dresses

HomeProm DressesStrapless Prom Dresses

Show filters
Sort:
Size
Color
Price
All filters
Sort
Loading...
tag of the document. This will help to improve the load of the images // during color swatches interaction on PLP const preloadBackground = (entries, observer) => { entries.forEach(async (entry) => { if (entry.isIntersecting) { const swatch = entry.target; const images = swatch.dataset.varimg.split(','); images.forEach((img, index) => { // preload image const link = document.createElement('link'); link.href = buildSrc(img); link.imagesrcset = getSrcset(img); link.imagesizes = cssImageMediaCondition; link.rel = 'preload'; link.as = 'image'; document.getElementsByTagName('head')[0].appendChild(link); }); swatch.removeAttribute('data-varimg'); switchObserver.unobserve(swatch); } }); }; const switchObserver = new IntersectionObserver(preloadBackground, { root: null, // Default is the viewport rootMargin: '30px', threshold: 0.05, // Load image when 10% of the div is visible }); // Sort options function getPageParam() { const urlParams = new URLSearchParams(window.location.search); const pageParam = urlParams.get('page'); return pageParam ? parseInt(pageParam, 10) : 1; } domLoadedPage = getPageParam(); setupSortDropdown('.fs_sort_by_wrap_desktop', '.fs_sort_by_options_desktop', '.fs_sort_by_select_desktop'); const sortBySelect = document.getElementById('sortByDesktop'); let sortByValue = getSortBy(); // call the function and store the returned value sortBySelect.value = sortByValue; // update the desktop dropdown value on page load // update sort mobile dropdown value on page load const validSortOptions = ['price_min_to_max', 'price_max_to_min', 'creation_date', 'relevency']; sortByValue = validSortOptions.includes(sortByValue) ? sortByValue : 'relevency'; const inputField = document.querySelector(`form [data-value="${sortByValue}"]`); if (inputField) { inputField.checked = true; // update the value of the option } else { console.error(`No radio button found with data-value="${sortByValue}"`); } const form = document.getElementById('sortForm'); if (form) { form.addEventListener('change', (event) => { if (event.target.name === 'sort') { const selectedValue = event.target.getAttribute('data-value'); if (selectedValue && validSortOptions.includes(selectedValue)) { setUrlParam('sortBy', selectedValue, true); resetPageAndScroll(); updateOtherDropdown(selectedValue); } } }); } updateOtherDropdown(getSortBy()); if (sortBySelect) { sortBySelect.addEventListener('change', function () { if (sortBySelect.value && validSortOptions.includes(sortBySelect.value)) { setUrlParam('sortBy', sortBySelect.value, true); } }); } // Description 'read more' function toggleReadMore(button) { const container = button.parentNode; const isExpanded = container.getAttribute('aria-expanded') === 'true'; container.setAttribute('aria-expanded', !isExpanded); if (isExpanded) { button.querySelector('.button-text').textContent = 'more'; } else { button.querySelector('.button-text').textContent = 'Show less'; } } function visibleReadMore() { const toggleButtons = document.querySelectorAll('.fs_collection_top_toggle'); toggleButtons.forEach(button => { const description_children = button.previousElementSibling.children; let description_scroll_width = 0; let description_client_width = 0; for(const child of description_children) { description_scroll_width += child.scrollWidth; description_client_width += child.clientWidth; }; button.style.display = (description_scroll_width > description_client_width) ? 'block' : 'none'; }); } window.addEventListener('DOMContentLoaded', visibleReadMore); // category pills GTM const categories = document.querySelectorAll('.category-pills__pill'); let category; let categoryHandle; let categoryId; const pushCategoryPills = (category, categoryHandle, categoryId, typeCategory) => { if (category && categoryHandle && categoryId && typeCategory) { const categoryPills = { event: `categoryPills`, category: category, categoryHandle: categoryHandle, categoryId: categoryId, typeCategory: typeCategory }; window.dataLayer.push(categoryPills); } } categories?.forEach(category => { category.addEventListener('click', function(e) { try { category = e.currentTarget.getAttribute('data-category'); categoryHandle = e.currentTarget.getAttribute('data-collection-handle'); categoryId = e.currentTarget.getAttribute('data-collection-id'); typeCategory = e.currentTarget.getAttribute('data-type-category'); pushCategoryPills(category, categoryHandle, categoryId, typeCategory); } catch (error) { console.error('Error in category click event:', error); } }) })

Dare to Shine: Strapless Prom Dresses for Your Perfect 2025 Look!

Make your grand entrance at Prom 2025 with Windsor’s stunning strapless prom dresses! Designed to capture every magical moment, this collection features glamorous styles tailored to fit your vision of the perfect prom night.

Discover sleek sleeveless prom dresses with chic necklines, shimmering fabrics, and eye-catching details that make you shine on the dance floor. Whether you prefer fitted mermaid silhouettes or flowing A-line gowns, there’s a strapless formal dress here to suit your unique style.

Looking for flexibility? Check out removable strap dresses for a customizable look that transitions effortlessly from the red carpet to the after-party. With elegant options in timeless hues and trend-forward designs, you’re sure to find a dress that matches your personality and leaves you feeling confident and radiant.

Shop Windsor’s strapless prom dresses today and start turning dreams into unforgettable memories.

How do I make sure a strapless prom dress stays in place?

Look for dresses with built-in support like boning, no-slip or grip lining, or adjustable corset backs to ensure a secure fit throughout the night.

What’s the best way to accessorize a strapless prom dress?

Highlight your neckline with a statement necklace or choker, or keep it simple with dazzling earrings. Add a clutch or bracelet for a polished touch.

Are strapless prom dresses comfortable for dancing?

Yes! Opt for styles with stretchy fabrics or secure fits like fitted bodices to move comfortably on the dance floor.

How do I pick the right size for a strapless dress?

Take accurate bust, waist, and hip measurements and refer to Windsor’s size chart. If you're between sizes, consider details like lace-up backs that provide a more custom fit.

What undergarments should I wear with a strapless prom dress?

Strapless bras, adhesive bras, or built-in cups are great options for seamless support. Shapewear can also provide extra smoothing. Explore women's intimates including shapers and stick bras here.

Can I customize my strapless prom dress with straps later?

Many dresses in the collection include removable straps for a versatile look, or you can consult a tailor for additional options. Explore the full collection of 2025 Prom Dresses from Windsor for more sleeveless and removable strap options.

  • Marissa Embroidered Rose Velvet Dress

    Special Occasion

    Keep it charming and lovely with enchanting roses! Our Marissa dress features a plunging sweetheart neckline, padded cups, boning at the sides for structure and a gel no slip-slip strip. Her bodice features an embroidered rose design with a metallic trim and sparkling heat stones. Her velvet skirt features a slim fit with a bold high slit to bring the drama! Marissa is composed of a mesh bodice and velvet fabric that offers a form hugging fit with a moderate stretch. Dress is fully lined and includes a back zipper closure with hook and eye clasp.

     

     

    Special Occasion products cannot be returned to any retail locations.

    Style Number/Barcode: 05005-0000

    Category Name: Strapless Prom Dresses

    Price: $74.97 $209.90

    On Sale: Yes

    Availability: Out of Stock

    Product Badge:
    • Clearance
  • Oksana Marabou Trim Formal Crepe Dress

    Special Occasion 

    This captivating gown will command attention in any room! She features a strapless neckline with removable marabou trim, a slim fit bodice with princess seaming details, padded cups, and a floor-length silhouette with a high side slit. Fully lined and composed of crepe fabric, the dress offers a form-flattering fit with a slight stretch. Includes a zipper and hook and eye closure at the back. 

    Model is 5'9" with a 34" bust, 24" waist and 34.5" hips. She is wearing a size small

    Special Occasion products cannot be returned to any retail locations.

    Style Number/Barcode: 05002-0205

    Category Name: Strapless Prom Dresses

    Price: $25.97 $69.90

    On Sale: Yes

    Availability: Out of Stock

    Product Badge:
    • Clearance
  • Bethany Formal Satin Rhinestone Dress

    Special Occasion 

    Bring the luxe to the night in our charming Bethany dress! She features a a strapless sweetheart neckline, a built in no slip silicone strip for secure fit, padded cups and vertical princess seams. Her slim fit bodice leads to a party length skirt accented with pleats and side pockets adorned with a sparkling gemstone accent. Dress is composed of a satin fabric that offers a form hugging fit with minimal stretch. Includes a knit lining and petticoat. 

    Model is 5'9" with 32" bust, 24" waist and 34.5" hips. She is wearing a size small.

    Special Occasion products cannot be returned to any retail locations.

    Style Number/Barcode: 05001-0095

    Category Name: Strapless Prom Dresses

    Price: $49.97 $149.90

    On Sale: Yes

    Availability: Out of Stock

    Product Badge:
    • Clearance
  • Lexi Embroidered Satin Strapless Dress

    Special Occasion

    Conjure a little fairy tale magic in a dress truly fit for a princess! Our Lexi mini is made from a smooth satin and features intricate multi-color floral embroidery dotted with tiny iridescent beads from bust through waist. Lexi has a strapless bodice with lattice tie back, a padded bust, and flexible boning at sides. Her A-line skirt features a back zip, pockets at either hip, inverted pleats, and a tulle-trimmed underlay for added volume. Lexi is lined, has a more structured silhouette, and is made from woven materials with minimal stretch.

    Model is 5'6.5" with a 32" bust, 23.5" waist and 35" hips. She is wearing a size small.

    Special Occasion products cannot be returned to any retail locations.

    Style Number/Barcode: 05001-0100

    Category Name: Strapless Prom Dresses

    Price: $59.97 $189.90

    On Sale: Yes

    Availability: Out of Stock

    Product Badge:
    • Clearance
  • Madonna Satin Evening Gown

    Special Occasion

    Introducing our Madonna Gown! She is designed with a pleated straight neckline with a drape overlay, off the shoulder sleeves, and a fitted bodice. Her cups are padded, and she features a vertical princess seam that creates a flattering fit. Slanted vertical seams at the waist line create a form fitting silhouette, and her hem is floor length, and features a side slit design that hits high thigh. She is composed of a satin like material that offers moderate stretch.

    Special Occasion products cannot be returned to any retail locations.

    Style Number/Barcode: 05002-0141

    Category Name: Strapless Prom Dresses

    Price: $26.97 $72.90

    On Sale: Yes

    Availability: Out of Stock

    Product Badge:
    • Clearance
  • Liza Satin Mesh Party Dress

    Special Occasion

    Ready for an epic evening? Then light up the night in our lovely Liza dress! She features a strapless, seamed sweetheart bodice with light padding at bust and a back zip. Liza's A-line satin skirt has pockets and sits atop a structured mesh-tulle underlay, giving her party-perfect volume. Liza is lined and made from a smooth, shiny cotton blend with moderate stretch.

    Special Occasion products cannot be returned to any retail locations.

    Style Number/Barcode: 05001-0022

    Category Name: Strapless Prom Dresses

    Price: $29.97 $69.90

    On Sale: Yes

    Availability: Out of Stock

    Product Badge:
    • Sale
  • Jan Formal Strapless Bow Dress
    Special Occasion

    All you need is the perfect bow to bring your look together! Jan features a navy blue color, a strapless sweetheart neckline, a no slip strip, built in boning for support, ruching along the left seam and a curve hugging floor length mermaid silhouette. Her back features a statement making large bow accent to add an extra feminine touch! Dress is composed of a lined textured satin fabric that offers a moderate stretch. Includes a hidden back zipper closure.

    Model is 5'7" with a 32.5" bust, 24" waist and 34" hips. She is wearing a size three.
     

    Special Occasion products cannot be returned to any retail locations.

    Style Number/Barcode: 05005-0469

    Category Name: Strapless Prom Dresses

    Price: $29.97 $239.90

    On Sale: Yes

    Availability: Out of Stock

    Product Badge:
    • Clearance
  • Kari Strapless Beaded Tulle Dress
    Special Occasion 

    Radiate and glow from within as you dazzle in our dreamy Kari dress! She features a strapless sweetheart neckline, a non slip strip, padded cups for support and a slim fit bodice that leads to a trumpet silhouette with sheer tulle panels. Her all over beaded design features aquamarine sequins, pearl accents and large gemstones. Dress is composed of a beige hued lined mesh fabric that offers a form hugging fit with minimal stretch. 

    Model is 5'7" with a 34" bust, 24" waist and 36" hips. She is wearing a size three.

    Special Occasion products cannot be returned to any retail locations.

    Style Number/Barcode: 05005-0432

    Category Name: Strapless Prom Dresses

    Price: $109.97 $299.90

    On Sale: Yes

    Availability: Out of Stock

    Product Badge:
    • Clearance
  • Cora Formal Tulle Ball Gown
    Special Occasion 

    Make your night a dream come true as you twirl the night away in our enchanting Cora dress! She features a combination black with natural hue, an off the shoulder neckline with a built in no slip strip, a sweetheart bust with an unlined V-shaped mesh inset, padded cups, shoulder strap accents and princess seams. Her waist features mesh insets adorned with floral applique details and twinkling rhinestones. Her slim fit bodice leads to a voluminous tulle ball gown silhouette. Dress offers a relaxed fit with minimal stretch. Includes a smooth knit lining, petticoat and back zipper closure.

    Special Occasion products cannot be returned to any retail locations.

    Style Number/Barcode: 05004-0555

    Category Name: Strapless Prom Dresses

    Price: $19.97 $199.90

    On Sale: Yes

    Availability: Out of Stock

    Product Badge:
    • Clearance
  • Kia Magical Evening Glitter Gown
    Special Occasion

    Have the most magical evening in our Kia dress! This ivory beauty looks straight out of a fairy tale with a strapless sweetheart neckline, padded cups, built in boning, wide lattice straps on the sides to show a bit of skin, and a hidden back zipper closure. Her high waist seam leads to a floor-length skirt that will make you feel like a princess! Kia is composed of an ivory satin and tulle fabric with a baby blue, glitter fern pattern throughout. Dress offers a relaxed fit with minimal stretch. Includes a petticoat and knit lining.

    Model is 5'3 with a 32" bust, 24" waist and 35" hips. She is wearing a size three.

    Special Occasion products cannot be returned to any retail locations.

    Style Number/Barcode: 05004-0528

    Category Name: Strapless Prom Dresses

    Price: $19.97 $199.90

    On Sale: Yes

    Availability: Out of Stock

    Product Badge:
    • Clearance
  • Catalina Strapless Satin Ball Gown
    Special Occasion

    Stay stunning in satin as you make your grand entrance in our charming Catalina red dress! She features a strapless straight neckline, a built in no slip strip and a fold over accent. Her slim fit bodice leads to a sweeping floor length silhouette that is accented with hidden side pockets, pleating details and a petticoat. Dress is composed of a satin fabric that offers a minimal stretch. Includes a back zipper closure.

    Model is 5'9" with a 32" bust, 24" waist and 34" hips. She is wearing a size three.

    Special Occasion products cannot be returned to any retail locations.

    Style Number/Barcode: 05004-0517

    Category Name: Strapless Prom Dresses

    Price: $36.97 $99.90

    On Sale: Yes

    Availability: Out of Stock

  • Adaline Strapless Floral Ball Gown
    Special Occasion 

    Charm in a floral frenzy in the sweetly inspired Adaline dress! She features a dreamy light blue hue, a sleeveless bodice, a sweetheart neckline, a built in no slip strip, padded cups and princess seams. Her slim fit bodice leads to a pleated ball gown silhouette that is accented with hidden side pockets. She is composed of a satin fabric that features a combination pink and blue hued floral print design. Dress offers a relaxed fit with slight stretch.

    Special Occasion products cannot be returned to any retail locations.

    Style Number/Barcode: 05004-0500

    Category Name: Strapless Prom Dresses

    Price: $44.97 $124.90

    On Sale: Yes

    Availability: Out of Stock

    Product Badge:
    • Clearance
  • Julie Strapless Sweetheart Ball Gown
    Special Occasion 

    Make an enchanting entrance in the ever-captivating Julie navy dress! She features a strapless sweetheart neckline with an an unlined mesh inset, a silicone no slip-strip, padded cups and built in boning. Her bodice is adorned with a floral applique detail and sparkling heat stones. Her floor length silhouette brings all the drama! Dress is composed of a lined mesh fabric that offers a relaxed fit with minimal stretch. Includes a hidden back zipper closure.

    Model is 5'9" with a 34" bust, 24" waist and 34.5" hips. She is wearing a size small.

    Special Occasion products cannot be returned to any retail locations.

    Style Number/Barcode: 05004-0514

    Category Name: Strapless Prom Dresses

    Price: $29.97 $199.90

    On Sale: Yes

    Availability: Out of Stock

    Product Badge:
    • Clearance
  • Renee Strapless Sweetheart Ball Gown
    Special Occasion 

    Stun in sophistication as you draw all eyes on you in our dreamy Renee dress! She features a charming mauve hue, a strapless bodice, a sweetheart neckline, a built in no slip strip, padded cups and princess seams. Her slim fit bodice leads to a voluminous ball gown silhouette with pleated seams and hidden side pockets. Dress is composed of a satin fabric that offers a relaxed fit with minimal stretch. Includes knit lining, petticoat and a back zipper closure. Includes removable adjustable straps.

    Special Occasion products cannot be returned to any retail locations.

    Style Number/Barcode: 05004-0501

    Category Name: Strapless Prom Dresses

    Price: $44.97 $124.90

    On Sale: Yes

    Availability: Out of Stock

    Product Badge:
    • Clearance
  • Sariah Strapless Rose Ball Gown
    Special Occasion 

    Look as gorgeous as a fresh bouquet of roses in our charming Sariah dress! She features a black hued bodice with a strapless sweetheart neckline, a built in no slip strip, padded cups, built in boning and lattice strap accents on the side with mesh insets. Her slim fit bodice leads to a satin red rose print ball gown silhouette accented with hidden side pockets, a petticoat and pleating details. Dress offers a relaxed fit with minimal stretch. Includes a back zipper closure.

    Model is 5'3" with a 32" bust, 24" waist and 35" hips. She is wearing a size three

    Special Occasion products cannot be returned to any retail locations.

    Style Number/Barcode: 05004-0493

    Category Name: Strapless Prom Dresses

    Price: $29.97 $199.90

    On Sale: Yes

    Availability: Out of Stock

    Product Badge:
    • Clearance
  • Marie Strapless Satin Ball Gown
    Special Occasion 

    Make your night a regal affair as you radiate a look fit for a Queen in our timelessly gorgeous Marie dress! She features a black hued bodice with a strapless sweetheart neckline, a built in no slip strip, padded cups, built in boning and lattice strap accents on the side with mesh insets. Her slim fit bodice leads to a light blue hued satin ball gown silhouette accented with hidden side pockets, a petticoat and pleating details. Dress offers a relaxed fit with minimal stretch. Includes a back zipper closure.

    Model is 5'9" with a 32" bust, 24" waist and 34" hips. She is wearing a size three.

    Special Occasion products cannot be returned to any retail locations.

    Style Number/Barcode: 05004-0457

    Category Name: Strapless Prom Dresses

    Price: $29.97 $199.90

    On Sale: Yes

    Availability: Out of Stock

    Product Badge:
    • Clearance
  • Marianne Pleated Sweetheart Dress
    Special Occasion

    Our Marianne dress brings sweet and sophisticated to your next social event. She features a strapless deep sweetheart neckline with boning detail, a straight back with exposed zipper closure, a wrap bodice with pleated details that flatter any body type, and a slim, floor-length skirt with a high side leg slit. Marianne is composed of a stretchy mauve crepe fabric. 

    Model is 5'6.5 with a 32" bust, 23.5" waist and 35" hips. She is wearing a size small.

    Special Occasion products cannot be returned to any retail locations.

    Style Number/Barcode: 05002-6688

    Category Name: Strapless Prom Dresses

    Price: $19.97 $64.90

    On Sale: Yes

    Availability: Out of Stock

  • Bianca Woman Of The Hourglass Dress
    Special Occasion

    Showcase curves in our mystifying Bianca color block black dress! She features a strapless sweetheart neckline and padded cups. Her natural hued color block stripes run along her sides to create a flattering hourglass silhouette to create a va va voom illusion effect! She is composed of a lined glitter mesh dress that offers a moderate stretch.

    Model is 5'8.5" with a 32" bust, 24" waist and 35" hips. She is wearing a size small.
     

    Special Occasion products cannot be returned to any retail locations.

    Style Number/Barcode: 05002-6648

    Category Name: Strapless Prom Dresses

    Price: $24.97 $69.90

    On Sale: Yes

    Availability: Out of Stock

    Product Badge:
    • Clearance
  • Desiree Satin Sweetheart Ruffle Dress
    Special Occasion

    Desiree is sexy with all the right details. She features a strapless sweetheart neckline, padded cups, a no slip strip, built in boning, a straight back with a hidden zip up closure, princess seams, and a high waist seam. Her body-hugging floor length skirt has vertical ruffles down the front and the back, and has a slight flare at the them. Desiree is composed of a stretchy, black satin knit fabric.

    Model is 5'9 with a 32" bust, 23" waist, and 34.5" hips. She is wearing a size small.

    Special Occasion products cannot be returned to any retail locations.

    Style Number/Barcode: 05002-6586

    Category Name: Strapless Prom Dresses

    Price: $29.97 $79.90

    On Sale: Yes

    Availability: Out of Stock

    Product Badge:
    • Clearance
  • Janet Sweetheart Slit Formal Dress
    Special Occasion

    A little sweet, a little naughty. Our stunning Janet formal dress charms with her sweetheart neckline, built in boning and full A-line silhouette but is ready to bring the heat with her thigh high slit! Her taffeta fabric and pleating at the bust and waist-line add the perfect amount of shimmer and texture for a uniquely elegant look. Includes banded hemline, hidden side pockets and a back zipper closure. Includes an additional bodysuit contrast bottom lining with snap button closure.

    Model is 5'7" with 32" bust, 23" waist and 34.5" hips. She is wearing a size small.

    Special Occasion products cannot be returned to any retail locations.

    Style Number/Barcode: 05002-6554

    Category Name: Strapless Prom Dresses

    Price: $29.97 $79.90

    On Sale: Yes

    Availability: Out of Stock

    Product Badge:
    • Clearance
  • Miranda Glitter Mermaid Formal Dress
    Special Occasion 

    Elegance with minimal effort. Our Miranda dress is exactly that. She features a strapless neckline with scalloped trim, a form hugging mermaid silhouette, and a stretchy knit fabric adorned with glitter. Dress includes a back zipper closure.

    Special Occasion products cannot be returned to any retail locations.

    Style Number/Barcode: 05002-6549

    Category Name: Strapless Prom Dresses

    Price: $19.97 $99.90

    On Sale: Yes

    Availability: Out of Stock

    Product Badge:
    • Clearance
  • Elise Strapless Sequin Mermaid Dress
    Special Occasion 

    Gorgeous is an understatement! Our Elise dress take elegance to another level. She comes in black and features a beautiful rose gold sequin scroll design on the front torso and along the length of the dress on the back. She has a strapless sweetheart neckline, padded cups and a form-hugging mermaid silhouette. Her lined crepe fabric offers moderate stretch. Includes a side zipper closure.

    Model is 5'8" with a 32" bust, 23" waist and 36" hips. She is wearing a size small.

    Special Occasion products cannot be returned to any retail locations.

    Style Number/Barcode: 05002-6515

    Category Name: Strapless Prom Dresses

    Price: $39.97 $109.90

    On Sale: Yes

    Availability: Out of Stock

    Product Badge:
    • Clearance
  • Briella Formal High Slit Boa Dress
    Special Occasion 

    Hello darling! Make a diva-worthy impression in our bold Briella dress! She features an all over black hue, a strapless straight neckline and a faux feathered boa trim to bring the drama! Her slim fit bodice leads to curve hugging floor length silhouette accented with a high side slit. Briella offers a moderate stretch and includes a back zipper closure with a fish hook clasp.

    Special Occasion products cannot be returned to any retail locations.

    Style Number/Barcode: 05002-6405

    Category Name: Strapless Prom Dresses

    Price: $19.97 $74.90

    On Sale: Yes

    Availability: Out of Stock

  • Audrey Pleated Sweetheart Dress
    Special Occasion 

    Enchant as you make a memorable entrance in our Audrey dress! She features a rich burgundy hue, a sweetheart neckline with a built in no slip strip, padded cups and pleated bodice. Her slim fit waist leads to a floor length silhouette that is accented with a high side slit to show off glowing gams! She is composed of a lined chiffon fabric that offers a relaxed fit with minimal stretch. Includes a back zipper closure.

    Model is 5'8" with a 32.5" bust, 25" waist and 35" hips. She is wearing a size three.

    Special Occasion products cannot be returned to any retail locations.

    Style Number/Barcode: 05002-6383

    Category Name: Strapless Prom Dresses

    Price: $19.97 $79.90

    On Sale: Yes

    Availability: Out of Stock

    Product Badge:
    • Clearance