The thickness of a knee sleeve determines everything: how much support you get, how much freedom of movement you maintain and where the sleeve is at its best. 5mm and 7mm seem a small difference, but in the squat it feels completely different. If you choose wrong, then you either have too little support on your heavy sets, or a sleeve that restricts your movement restricts where you want to be free.
In this guide you read exactly what the difference is between 5mm and 7mm knee sleeves, for which training each thickness fits and which one you need.
What does the thickness of a knee sleeve do?
A knee sleeve of neoprene provides compression, warmth, and stability around your knee. The thickness determines how much. Thinner material moves more smoothly with you and keeps your knee warm with a lot of freedom of movement. Thicker material provides more compression and support, especially at the bottom of the squat, but feels firmer and stiffer. It is a trade-off between freedom of movement and support, and which way you want to go depends on how you train.
5mm knee sleeves: freedom of movement and comfort
5mm sleeves are the all-rounder. They provide compression and warmth without restricting your movement restrict, and are comfortable across a wide range of exercises. Therefore they are popular in CrossFit, conditioning work, Olympic lifting, and lighter to average squats, anywhere you need a large range of motion and speed have.
For whom: CrossFit athletes, weightlifters, and lifters who want warmth and light support without restriction.
7mm knee sleeves: maximum support and stability
7mm sleeves are thicker and provide more compression and stability. You especially feel it at the bottom of the heavy squat: the sleeve provides support and a firm, confident feeling as you come out of the hole. That makes 7mm the standard for powerlifting and heavy strength training, where stability and warmth around the knee joint matter most.
For whom: powerlifters and everyone who squats heavy and seeks maximum support and stability.
It is indeed a conscious choice: 7mm is firmer and stiffer, which with very dynamic movements can feel somewhat restrictive. For heavy squats, that's exactly what you want.
That 7mm is widely used in powerlifting aligns with the official IPF rules, where knee sleeves during competitions may have a maximum thickness of 7mm. (Machek et al., 2021)
5mm vs 7mm knee sleeves in an overview
| Thickness | Support | Freedom of movement | For whom |
| 5mm | Average | High | CrossFit, dynamic, lighter squats |
| 7mm | High | Average | Heavy squats, powerlifting |
Which thickness suits you?
Keep it simple and look at your type of training:
- Do you mainly train CrossFit, conditioning, or dynamic movements? Then 5mm fits: support and warmth without restricting your movement.
- Do you squat heavy and serious, or do powerlifting? Then 7mm is the logical choice: maximum stability where it counts.
That's also where the Thor Athletics choice: our knee sleeves are 7mm, built for serious, heavy squats and leg days, exactly where thickness and stability make the difference. If you’re looking for a sleeve for light, dynamic work, then 5mm is a better match; for the heavy side of strength training, choose 7mm.
In practice means that: the 7mm Knee Sleeves for heavy squats, and the extra stiff variant for those who want even more support and firmness you want under maximum load.
7mm regular or extra stiff: what’s the difference?
Within 7mm there are there are two versions. The regular 7mm provides firm support and stability and remains comfortable to put on, the right choice for most serious squatters. The extra stiff 7mm is even firmer and provides maximum support at the bottom the squat, but feels harder and takes more effort to put on. If you towards your maximum or do powerlifting, then the extra stiff variant worth considering; for general heavy strength training, the regular 7mm is good.
Thickness isn’t everything: also pay attention to size
The best thickness only works if the size is right. A too loose sleeve provides hardly any support, a too tight pinches. How to determine your size, read in determining knee sleeve size. If in doubt also whether you even need sleeves, check out buying knee sleeves: the pros and cons.
If you fall between two sizes, let your goal decide. For maximum support during heavy squats choose the tighter (smaller) size; for comfort and warmth during daily use the larger size. A tight 7mm sleeve provides the most stability, but should never pinch or cause tingling, then it’s too small.
Frequently asked questions about knee sleeves 5mm vs 7mm
Are 7mm knee sleeves better than 5mm?
Not better, just otherwise. 7mm gives more support for heavy squats; 5mm gives more freedom of movement for dynamic work. The best thickness depends on how you train.
Which thickness knee sleeves for powerlifting?
7mm. The extra compression and stability are exactly what you want under heavy squats, especially at the bottom of the movement.
Which thickness for CrossFit?
5mm. You keep freedom of movement and speed during varied movements, with enough warmth and light support.
Do knee sleeves really give more strength?
They make you not stronger, but provide stability, warmth, and a confident feeling at the bottom of the squat. Many lifters feel more confidence and drive from the hole. Think of it as support and security, not a replacement for strength.
5mm or 7mm for beginners?
Are you starting seriously with heavier squats, then 7mm is a great starting point for support and warmth. If you train light and varied, 5mm is sufficient.
Choose the thickness that fits your squat, and your knees stay warm, stable, and secure under the bar.
