11-0541-X 11-0541-X 29.99

Reaction Knee Undersleeve


Availability: In stock

Attention Medicare Patients

DonJoy Reaction Undersleeve Replacement

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Product Details

Product Description

Replacement undersleeve for the DonJoy Reaction Knee Brace and DonJoy OA Reaction Web Knee Brace. Made with 85% Nylon and 15% Spandex.
Size Chart & Fit Help

Take the measurement of your thigh and calf 6" above and below your kneecap using a flexible type tape measure.  Use the circumference you measure here to choose your size.

Note: The DonJoy Reaction Sleeve runs small. If you measure between sizes we recommend going up one size for optimum comfort and fit

    Size Thigh
    XS/S 13.5" - 18 .5" (39-47 cm)
    M 18.5" - 21" (47-53 cm)
    L 21" - 23.5" (53-60 cm)
    XL 23.5" - 26.5" (60-67 cm)
    XXL 26.5" - 29.5" (67-75 cm)
    XXXL 29.5" - 32" (75-83 cm)
Product Questions (12)

Product Questions

DonJoy Reaction Knee Undersleeve

Product Questions

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  • Kat at 6/27/2016 4:36 PM
    • I ordered a medium/large brace but the sleeve is too large. When I looked at the replacement sleeves they come in both medium and large. Which is the size that comes with the medium/ large brace? Is it medium or large?
    • The sleeve that comes with the Medium/Large Reaction is a Medium. If the Medium sleeve is too large, try ordering a small.
  • Michele at 2/25/2016 5:05 PM
    • Need a second under sleeve for my daughter's custom Force Point knee brace (lacrosse athlete, s/p ACL repair). She likes what came with the brace but it's getting stretched out after almost a year of frequent use. Is this the correct choice? Thank you!
    • We have the Cotton/Lycra Undersleeve for the rigid knee braces. https://www.betterbraces.com/knee-brace-undersleeve-cotton-lycra
  • Alfred at 10/11/2015 4:00 AM
    • I received my Donjoy brace from my doctor who measured my calf, knee and thigh before ordering the brace and it relieved the awful pain in my knee. But I get blisters from where it is connected. My question is should I have had a sleeve with the brace?
    • Alfred
      A undersleeve could help with any friction the brace is creating on your skin.
  • Markanthony Williams at 5/27/2015 2:39 PM
    • What other donjoy knee braces can I wear the DonJoy Reaction Knee Undersleeve with?
    • You can wear that under sleeve with any brace although it is only 13 inches in leangth
  • Laura at 5/14/2015 4:44 PM
    • What options are there if you have a silicone allergy? So far we have had to wear the sleeve inside out. This works but obviously not as good as with the "stay put" dots of silicone.
    • Laura
      If the sleeve is causing irritation we should be able to sen our Lycra undersleeve to you instead. Just call BetterBraces if you purchased from there, or call customer care at 800-336-6569
  • Peter Teichman at 1/12/2015 12:21 AM
    • I have a Bledsoe knee brace that slides down while using, will the reaction knee sleeve prevent this? I need more friction to prevent the sliding.
    • Peter
      If you want an undersleeve to prevent your Bledsoe brace from slipping I would suggest the neoprene undersleeve.
  • Van at 8/16/2014 9:04 PM
    • My Dr. put me in the DONJOY Drytex™ Hinged Knee Brace about 2 weeks ago. Been doing well till it hit over 100 degrees recently. Now I have a bad heat rash. I also wear braces on both feet/legs and the heat rash is there also. What do you recommend to wear under the the foot/leg & knee brace to keep down the heat rash? I was looking at the DonJoy Reaction Knee Undersleeve and was wondering if this would help?
    • Van
      The sleeve for the Reaction might work under the other braces to keep the heat rash down
  • john at 6/1/2014 1:36 PM
    • Where can I buy a reaction knee sleeve?
    • John
      Call Customer Care at 800-336-6569
  • Jordan at 4/15/2014 7:28 PM
    • I was wondering what is the length of the Don Joy reaction under sleeve? I currently have one that is 15.5' and am looking for something close.
    • Un-stretched it is about 13 inches
  • Roy at 1/20/2014 6:54 AM
    • Are you able to ship the Donjoy Reaction undersleeve to the UK? I already have the brace, which is excellent, but my sleeve is becoming threadbare.

      If you can send it, what shipping charge would I incur if I ordered two?

    • Hello,

      Unfortunately, we do not ship outside the U.S. Please contact your local representative for purchasing the replacement sleeve.


      Thanks for Contacting Donjoy.
  • Kelile at 12/16/2013 12:01 PM
    • I was issued a DonJoy Knee Brace back in 2001 or 2002 to better support my right knee that was made stable with screws. I found that knee brace to be cumbersome. Will this knee brace work for my knee?

      Thank you
    • Kelile
      Thank you for contacting product support. The Reaction Knee Brace is for those who suffer from anterior knee pain caused by patellofemoral dysfunction, problems associated with the kneecap and mild arthritis. If you need medial and lateral support you need to stick with a hinged knee support.
  • Roberta at 6/26/2013 11:43 AM
Reviews (21)


DonJoy Reaction Knee Undersleeve

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    Customer Reviews 21 item(s)

    Use of sleeve and brace before surgery and sleeve alone after

    Reviewed by:
    Before having knee surgery for a knee replacement my doctor ordered your brace and sleeve for me. The combination along with medication helped me greatly with the terrible pain I suffered. After the surgery I recently started using the sleeve alone because of pain and swelling. It has given me excellent results with pain and the swelling. I highly recommend your products.
    Posted on January 9, 2015

    This brace is great!

    Reviewed by:
    I just got my brace yesterday and I love it!! It helps support my knee so that I have no pain or swelling. It stays in place and doesn't pinch my leg. I like it better then the copper brace that I have and I wish I would have ordered two of them.
    Posted on September 24, 2015

    Slides Down

    Reviewed by:
    Size runs big and keeps sliding down bringing the brace with it
    Posted on November 11, 2016

    I NEVER want to experience a meniscus tear again -- but if I do, I know who to call.

    Reviewed by:
    This sleeve helps make my knee much more comfortable. I'm a large gal and needed a 3-X at the start. I have since orders the next two smaller sizes as the swelling in the knee and leg went down. This sleeve stays in place. Best of all, on the miserably hot and humid days we've been experiencing here in Kentucky, the sleeve is breathable and comfortable even on long days and through extended hours of wear.
    Posted on August 26, 2016

    Can't put my brace on without it!!

    Reviewed by:
    Verified Purchase
    I have been wearing a knee brace for 23 years. This is the ONLY sleeve I would ever wear or recommend. Its the BEST!! Thanks, God Bless......
    Pros: The Best! try it and see for yourself.
    Cons: I only found them a few years ago.
    Share Your Usage: Recovering from Injury, Daily Use, Chronic Instability
    Posted on June 26, 2017

    I would purchase this or something comparable by Better Braces.

    Reviewed by:
    Purchased the Donjoy Reaction Knee Undersleeve for my Husband who has knee problems he travels a lot prefers this brace because it breathes and it is long enough so that if he is able to extend the knee the sleeve is not cutting off his circulation.
    Posted on October 6, 2016

    Top notch!!

    Reviewed by:
    This goes perfectly with my brace. Regretfully since I managed to fracture the distal tip of my fibula I cannot wear the brace right now but I do wear the sleeve for compression and have found that it helps tremendously.
    Posted on August 27, 2016

    Not as pictured

    Reviewed by:
    Verified Purchase
    I bought this to wear under my shorter knee brace, but the one pictured and the one I got were very different. What I got was a plain black, thin cheaply made sleeve. The hem was very cheaply done and the material was not good quality. I sent this back.
    Cons: Not as pictured.
    Share Your Usage: Chronic Instability
    Posted on September 17, 2017
    Hi Pam, Thank you for your feedback. Sorry this brace did not work for you. We offer a no-risk, unconditional 30-day money back guarantee. View our return policy and start the returns process here: https://www.betterbraces.com/returns. Please contact customer service for any issues. Thank you, Customer Service 800-553-6019
    18 Sep, 2017

    Just right

    Reviewed by:
    Verified Purchase
    Perfect sleeve for under brace. Good fit. Just the right amount of compression.
    Pros: Good fit, comfortable
    Cons: No cons
    Share Your Usage: Chronic Instability, Sports
    Posted on August 9, 2017

    These braces saved my life :)

    Reviewed by:
    These braces saved my life :) I was using ace bandages that kept falling and constantly needed to be tightened. My dr's office recommended this brace to me. I tried it and loved it, then bought 3 more as back up :) I can walk up the stairs now and can even ride my bike in them.
    Posted on September 21, 2016

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