The Knee Sleeve That Stops Your Knee From Bending Backwards
Your knee stops at straight. The pain stops with it.
90 days risk-free. Still bends backwards? You pay nothing.
Over 20,000 happy knees
121,957+ people trust Theravyn
Compression, lateral stabilization and patellar support — the three things Theravyn is built on — have been studied in clinical trials:
PLOS One Network Meta-Analysis (2025) — Analysis of 139 randomized controlled trials. Knee braces were identified as the most effective type of intervention for reducing symptoms in knee osteoarthritis.
Ayık et al. (2025) — A randomized study involving 60 patients. Knee braces with lateral stabilizers improved balance and reduced pain in patients with knee osteoarthritis immediately after application.
Patella Pro Study, BMC (2014) — A multicenter randomized trial involving 156 patients. Medial patellar stabilization as a clinically evaluated approach for anterior knee pain.
Studies refer to the method (compression, stabilization, patellar support), not to Theravyn itself. Individual results vary. These statements have not been evaluated by the FDA. Theravyn is not intended to diagnose, treat, cure or prevent any disease. If you have a medical condition, talk to your doctor or physical therapist before use.
- Stops hyperextension. Your knee stops at straight.
- Ends the ache. No more strain behind your knee.
- No more mini squat. Still bends freely.
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90-day money-back guarantee
90-day money-back guarantee
Still bends backwards within 90 days? Send it back, pay nothing. One email to info@trytheravyn.com.
Shipping
Free shipping on every package. Orders are processed within 1–2 business days and typically arrive in 6–9 days. You'll get a tracking link by email the moment it ships.
Which size and side do I order?
Sizes run by body weight (S 110–130 lbs through 4XL 300 lbs+) so the compression sits right from day one. Theravyn is left/right specific — order one per knee, or the 2-pack for both knees.
I already do strength training. Do I need this?
Keep training. Muscles don't stop a knee bending backwards. Theravyn does.
Your knee bends backwards every time you stand
- Aches after 10 minutes on your feet
- Standing still hurts most
- A mini squat all day so it won't lock
A 24/7 workout you never signed up for. Theravyn ends it.
Why nothing else stopped it
- Strength: muscles can't stop it
- Physio: works on muscles, not this
- Tape: gone in two days
- Regular braces: squeeze, but don't stop it
Theravyn is built for exactly this.
How Theravyn stops it
1. The cause. Loose ligaments let your knee shoot past straight. Your weight hangs on them. That's the ache.
2. The stop. Turn the dial. Laces and side stabilizers hold your knee at straight.
3. The result. No more stretching. The ache fades. Your knee still bends freely.
4 parts. One job.
Dial: you set the support
Side stabilizers: stop your knee at straight
Gel pad: takes pressure off the kneecap
Silicone grip: stays put all day, even under jeans
What you'll notice
- First stand: your knee stops at straight
- Day one: no ache building up
- Week one: no more mini squat
- Week two: the standing ache is gone
Same knees. They just don't bend backwards anymore.
Why this is the sleeve for knees that bend backwards
Regular sleeves and braces
Stops your knee bending backwards
Takes the strain off your ligaments
No more 24/7 mini squat
Bends freely
You set the support (dial)
Stays put all day
Too tight, adds pain
Slides down
What people whose knees bend backwards say
Verified buyers, in their own words.
No more constant little bend
I've had hypermobile knees my whole life and they lock back when I stand still. One week with this on my right knee and I'm not doing the constant little bend to keep it from locking. Stays exactly where I put it.
Hannah L.
Verified buyer
Ten-hour hospital shifts
Nobody at the hospital has noticed I'm wearing anything. Ten hour shifts, it stays up, and I can back the dial off when I'm sitting.
Krista N.
Verified buyer
Steadier at the sink
I can get this on by myself now, that's the main thing. Knee feels steadier at the sink.
Elaine R.
Verified buyer
Questions from people with hypermobile knees
Does it actually stop my knee from bending backwards?
Yes. It holds your knee at straight so it can't sink back.
Will my knee pain go away?
If it comes from bending backwards, yes. Wear it daily for two weeks.
Will it stop me from bending my knee?
No. It only steps in at straight. Walking, sitting and stairs feel normal.
I already do strength training. Why would I need this?
Muscles can't stop a knee bending backwards. Theravyn does, so your training pays off.
Will it be too tight like my last brace?
Only if you set it that way. You control the dial.
Does it slide down?
No. The silicone grip holds it all day.
Which size and side do I order?
Sizes run by body weight (S 110–130 lbs up to 4XL 300 lbs+). Theravyn is left/right specific for a proper fit — order one per knee, or choose the 2-pack for both.
What if it doesn't work for me?
Wear it 90 days. Still bends backwards or still hurts? Every cent back.
Still bends backwards in 90 days? You pay nothing
Our promise to you:
You've paid for braces that hurt and tape that peeled off. Not this time.
90-day money-back guarantee. If your knee still bends backwards, you get every cent back.
