Colour

US Sizes

Get free shipping on this item!*
Learn More
  • Lightweight and breathable knit upper
  • Overlays at heel and midfoot add support
  • Low profile silhouette
  • Customizable lace-up closure secures the fit
  • Boost cushioning has a bouncy, cloud-like feel
  • Grippy rubber sole for durable traction

Pick a premium shoe for any occasion in these adidas Women’s Ultraboost 21 Shoes. Made from recyclable material, these classic runners integrate sock-like textile lining and a Primeknit upper for a light and secure feel every time you lace up. They feature a stretchweb rubber outsole for maximum traction and supportive heel counter sat above an ultra-responsive boost midsole for unrivalled stability and comfort.

Product Code: S23841

JD Sports Canada offers a variety of shipping options to meet your needs for shipping within Canada.

  • Free In-Store Pick-Up (Toronto Only)
  • Free Standard Shipping on all orders over $50
  • $10 Flat Rate Standard Shipping on any order that does not qualify for free shipping
  • $15 Express Shipping available for all orders
  • Standard shipping to NWT, Yukon and Nunavut is $20.00, Express is $30.00

Estimated delivery times:

  • In-Store Pick-Up: 1-7 business days (Toronto Only)
  • Standard Shipping: 5-7 business days
  • Express Shipping: 1-2 business days

We only ship to locations within Canada. We do not ship to international addresses.

View our Shipping Policy for more information.

    If your purchase is not working for you, we’ve got you covered by offering free and easy returns. View our Return Policy for more information.

      In most cases, whether your purchase was made at a JD Sports store or online at JDSports.ca, merchandise may be returned with an original sales receipt when the items are:

      • Unworn, in original condition;
      • Returned with price tags still attached (if the returned item is apparel or accessories);
      • Returned in their original box (if the returned item is footwear); and
      • Returned within 28 days of the original purchase.

      We reserve the right to determine whether merchandise without an original sales receipt may be returned. If we determine that a return is warranted despite the lack of an original sales receipt, the item(s) can only be an exchange or store credit issued in the amount of the lowest price at which the item(s) was offered for sale in the 28 day period prior to the return. No refunds will be provided in these circumstances.

      When returning or exchanging an item, you may be asked to provide your name and phone number. That information and the details of your return will be recorded in a company-wide database that we and our affiliates use to authorized returns, subject to our Privacy Policy.

      If you purchased an item from a JD Sports store, simply return your item at any JD Sports store. Items purchased online must be returned by mail to our warehouse. If you're looking to return an online order, please reach out to our Customer Experience team.

      Returned items may be exchanged when returned in store. Items returned by mail may not be exchanged.

      Adidas Shoes

      US Sizes Euro Sizes UK Sizes Inches CM
      6 39 5.5 9.25″ 23.5
      6.5 39 6 9.5″ 24.1
      7 40 6.5 9.625″ 24.4
      7.5 40-41 7 9.75″ 24.8
      8 41 7.5 9.9375″ 25.4
      8.5 41-42 8 10.125″ 25.7
      9 42 8.5 10.25″ 26
      9.5 42-43 9 10.4375″ 26.7
      10 43 9.5 10.5625″ 27
      10.5 43-44 10 10.75″ 27.3
      11 44 10.5 10.9375″ 27.9
      11.5 44-45 11 11.125″ 28.3
      12 45 11.5 11.25″ 28.6
      13 46 12.5 11.5625″ 29.4
      14 47 13.5 11.875″ 30.2
      15 48 14.5 12.1875″ 31
      16 49 15.5 12.5″ 31.8
      US Sizes Euro Sizes UK Sizes Inches CM
      4 35 2 8.1875″ 20.8
      4.5 35 2.5 8.375″ 21.3
      5 35-36 3 8.5″ 21.6
      5.5 36 3.5 8.75″ 22.2
      6 36-37 4 8.875″ 22.5
      6.5 37 4.5 9.0625″ 23
      7 37-38 5 9.25″ 23.5
      7.5 38 5.5 9.375″ 23.8
      8 38-39 6 9.5″ 24.1
      8.5 39 6.5 9.6875″ 24.6
      9 39-40 7 9.875″ 25.1
      9.5 40 7.5 10″ 25.4
      10 40-41 8 10.1875″ 25.9
      10.5 41 8.5 10.3125″ 26.2
      11 41-42 9 10.5″ 26.7
      11.5 42 9.5 10.6875″ 27.1
      12 42-43 10 10.875″ 27.6
      US Sizes Euro Sizes UK Sizes Inches CM
      3.5 35 2.5 8.625″ 21.9
      4 36 3 8.75″ 22.2
      4.5 36 3.5 9″ 22.9
      5 37 4 9.125″ 23.2
      5.5 37 4.5 9.25″ 23.5
      6 38 5 9.5″ 24.1
      6.5 38 5.5 9.625″ 24.4
      7 39 6 9.75″ 24.8
      US Sizes Euro Sizes UK Sizes Inches CM
      10.5 27 9.5 6.625″ 16.8
      11 28 10 6.75″ 17.1
      11.5 29 10.5 7″ 17.8
      12 30 11 7.125″ 18.1
      12.5 30 11.5 7.25″ 18.4
      13 31 12 7.5″ 19.1
      13.5 31 12.5 7.625″ 19.4
      1 32 13 7.75″ 19.7
      1.5 33 14 8″ 20.3
      2 33 1 8.125″ 20.6
      2.5 34 1.5 8.25″ 21
      3 34 2 8.5″ 21.6
      US Sizes Euro Sizes UK Sizes Inches CM
      0.5 16 0 3.25″ 8.3
      1 16 0.5 3.5″ 8.9
      1.5 17 1 3.625″ 9.2
      2 17 1 3.75″ 9.5
      2.5 18 1.5 4″ 10.2
      3 18 2 4.125″ 10.5
      3.5 19 2.5 4.25″ 10.8
      4 19 3 4.5″ 11.4
      4.5 20 3.5 4.625″ 11.7
      5 20 4 4.75″ 12.1
      5.5 21 4.5 5″ 12.7
      6 22 5 5.125″ 13
      6.5 22 5.5 5.25″ 13.3
      7 23 6 5.5″ 14
      7.5 23 6.5 5.625″ 14.3
      8 24 7 5.75″ 14.6
      8.5 25 7.5 6″ 15.2
      9 25 8 6.125″ 15.6
      9.5 26 8.5 6.25″ 15.9
      10 27 9 6.5″ 16.5
      MEN’S WOMEN’S KIDS’    
      5 3.5    
      5.5 4    
      6 4.5    
      6.5 5    
      7 5.5    
      6 7.5 6    
      6.5 8 6.5    
      7 8.5 7    
      7.5 9 7.5    
      8 9.5 8    
      8.5 10 8.5    
      9 10.5 9    
      9.5 11 9.5    
      10 11.5      
      10.5 12      
      11        
      11.5        
      12