Knee Sleeves for HYROX: Are They Allowed, Do They Help, and 5 mm or 7 mm?

Knee sleeves are one of the few pieces of kit HYROX lets you wear on course. Here’s what the rulebook says, what research shows sleeves actually do, and which thickness makes sense for a race that’s half running.

This guide uses the rulebook, published research and an independent review, listed under Sources. Our Amazon links are affiliate links; see our affiliate disclosure.

Are knee sleeves allowed in HYROX?

Yes. Section 10.1 of the 2026/27 Singles Rulebook lists the items you may wear during the race, and knee sleeves are first on the list, alongside gloves (not grips), a weightlifting belt, wristbands and hydration packs.

Two rules apply to anything on that list:

• Start to finish. If you use it, you keep it on for the whole race.
• No hand-offs. Passing gear to or from anyone during the race counts as outside assistance.

So if you only want sleeves for the lunges, you’ll be running 8 km in them too. Our race-day bag checklist covers everything else that’s allowed and banned. The same rule applies to a weightlifting belt.

Do knee sleeves actually help?

Not with strength, according to the best evidence we found. In a study published in Human Movement, Bennett and colleagues had 15 resistance-trained men and women squat with and without thick neoprene sleeves:

• Their one-rep max didn’t improve with sleeves.
• Frontal-plane knee mechanics didn’t change at maximal or submaximal loads.
• Glute activation on the way up was lower with sleeves.

The authors concluded that “wearing knee sleeves does not provide additive effects to weight lifted.”

That doesn’t make them useless. The study measured strength and knee mechanics, not comfort, so if sleeves feel better to you, that’s a fair reason to wear them. Just don’t expect them to make the sled or wall balls easier, and don’t use them to train through knee pain. If your knee hurts, see a physio or doctor.

5 mm or 7 mm for HYROX?

5 mm. Rehband makes 3, 5 and 7 mm sleeves, and thickness changes how stiff they feel:

Thickness	What the review found	HYROX fit
3 mm	Rehband’s thinnest option	Least support, least bulk
5 mm	Works for CrossFit and HIIT; comfortable to run in	Best balance for running, lunges and wall balls
7 mm	Too stiff for dynamic movements	Better kept for heavy squat days

In its Rehband vs SBD comparison, Powerlifting Technique says the Rehband 5 mm works for CrossFit and HIIT, and the reviewer wears them for squat-heavy workouts and can run and move comfortably in them. It found the 7 mm too stiff for dynamic movements. It recommends SBD sleeves for competitive powerlifters, not for CrossFit-style training.

Our pick: Rehband RX 5 mm

The Rehband RX 5 mm is the sleeve that fits HYROX best on the evidence above:

• Flexible enough to run in, per Powerlifting Technique’s long-term use.
• Contoured to the knee, with a wider top opening.
• Durable: the reviewer has used a 5 mm pair once or twice a week for about four years without stretching or fraying.
• Easy to buy: available on Amazon and at Rogue.

Note that Rehband sells sleeves individually, not in pairs, so order two if you want both knees covered. Check the size chart; the reviewer found Rehband’s sizing accurate.

Check price on Amazon: Rehband 5 mm knee sleeves

How to use them for HYROX

1. Train in them first. Do at least a few runs and a full lunge session in your sleeves before race day.
2. Put them on before the start. You can’t add or remove them mid-race.
3. Think about heat. In Las Vegas or a warm hall, neoprene adds warmth over 8 km. If you overheat easily, try a thinner sleeve. Our desert heat guide covers the rest.
4. Get your shoes right too. Shoes matter on the lunges and wall balls as much as sleeves do. See our best shoes for HYROX.

For more station kit, see our HYROX gear page and the wall balls guide.