Quick answer: Use a flexible measuring tape and follow the measurement location specified by the knee-sleeve manufacturer. Many sleeves are measured around the upper calf near the knee, but brands use different measurement points. Use the manufacturer’s leg position as well as its measuring point, record the circumference without compressing the skin, then compare it with that exact model’s current size chart.
Important: There is no universal knee-sleeve size chart. Always use the manufacturer's specified measurement location and current chart before ordering.
30-second knee-sleeve fit check
- Measure where the brand tells you: usually around the upper calf near the knee, but the location varies.
- Keep the tape snug, not tight: do not compress the skin or add extra room.
- Between sizes: check that exact brand's guidance before sizing down for more compression.
- Choose an exact model and thickness: 5 mm and 7 mm are common options; compare the exact model, fit and intended training. Sleeves do not guarantee injury prevention.
Knee sleeves are an optional source of warmth and compression during training. Fit and freedom of movement matter; wearing sleeves does not guarantee injury prevention or establish that a lift is safe.
When it comes to choosing the right knee sleeves; you want a pair that provides ample support without cutting off circulation or sliding down your leg.
No worries, we’ve got you covered!
Check out our easy 4-step guide to finding the right fit for you.
Easy 4-Steps to Measure for Knee Sleeves
1. Get a flexible measuring tape
Use a flexible fabric or tailor's measuring tape. If you don't have one, wrap a piece of string around your leg and measure the string with a ruler.
2. Use the leg position specified for the exact model
Follow the manufacturer’s instructions for sitting or standing and the amount of knee bend. A measuring position from one model is not a universal rule.
3. Measure at the location specified by the manufacturer
Wrap the tape around the exact point specified by the brand. Some manufacturers measure around the upper calf below the kneecap, while others use the kneecap or another nearby point. Keep the tape flat and snug without compressing the skin.
4. Compare your measurement with the brand's size charts
Use the current size chart for the exact sleeve you're considering. Sizing and measurement locations vary by brand and model, so don't assume one brand's measurement translates directly to another.
Current sizing examples: match the model and market
These two manufacturers specify different measuring points. Use the panel only when it matches the product and market you are buying; it does not validate an older listing or another thickness. Sources checked October 20, 2026. Recheck the linked maker page before ordering.
Rehband RX Knee Sleeve 5mm — United States
For this current model, sit with your heel on the floor and your relaxed knee bent about 30°. Locate a point 10 cm below the centre of the kneecap, then measure around the calf there. Keep the tape level and snug without compressing the skin.
| Size | Calf circumference (cm) | Calf circumference (in) |
|---|---|---|
| XXS | 29–31 | 11.4–12.2 |
| XS | 31–33 | 12.2–13 |
| S | 33–35 | 13–13.8 |
| M | 35–37 | 13.8–14.6 |
| L | 37–40 | 14.6–15.7 |
| XL | 40–43 | 15.7–16.9 |
| XXL | 43–46 | 17–18.1 |
The inch bands above reproduce the maker’s published rounding. At a shared boundary, Rehband distinguishes the intended fit: smaller for heavy lifting and firmer support; larger for dynamic activity or comfort. Its first-time-wearer guidance favors the larger size. Confirm with Rehband if the fit is unclear.
Source: Rehband US RX Knee Sleeve 5mm chart and measuring instructions, checked October 20, 2026. These ranges are not a verified match for every legacy Rehband colour, SKU or 7mm sleeve.
RockTape Assassins — Australia
The Australian Assassins page specifies circumference around the centre of the kneecap (patella), rather than the upper calf. It recommends the next size up when your measurement is near the top of a band.
| Size | Knee circumference (cm) |
|---|---|
| XS | 24–28 |
| S | 29–32 |
| M | 33–36 |
| L | 37–40 |
| XL | 41–46 |
The maker lists whole-centimetre bands with gaps between them. Do not invent a size for an unlisted decimal measurement; ask RockTape or the seller to resolve it. The page does not specify a knee angle, so confirm rather than borrowing Rehband’s position.
Source: RockTape Australia Assassins sizing instructions, checked October 20, 2026. This Australian chart is not verified for the older US listing or every Assassins generation.
Archived charts from the earlier guide
Retained for historical context. Their measurement rules and ranges are not current recommendations for an unspecified sleeve.
Archived RockTape graphic — not a current buying chart
This older graphic measures below the kneecap and advises sizing down. That differs from the current Australian instructions above. The exact US model/generation match is unverified; do not use it as a universal chart.
Archived Rehband graphic — not a current buying chart
The archived graphic’s XXL metric band is 43–46 cm, approximately 16.9–18.1 inches (calculated by dividing centimetres by 2.54). Its printed “16.9+” omits the upper bound. This checks the historical graphic’s units; it does not establish a current size recommendation. The exact legacy model match is unverified; use the current model’s linked chart.
What If I’m Between Knee Sleeve Sizes?
If your measurement falls between sizes, check the manufacturer's fit guidance first. A smaller size generally creates more compression, while a larger size may be easier to wear for longer sessions. Don't automatically size down unless the brand recommends it for your intended fit.
Should I choose 5mm or 7mm?
5mm and 7mm are common options; some product lines also offer other thicknesses.
Each is designed for a different purpose:
- 5mm – provides support while maintaining agility for WODs and metcons
- 7mm – a thicker, generally firmer feel for heavier lifting
Compare the exact models for the balance of compression, bulk and movement you prefer. A 5mm sleeve may be easier to move in during mixed WODs, while a 7mm sleeve often feels firmer for heavier lifting. Thickness alone does not determine fit, medical suitability or injury protection.
Still Not Sure?
Maybe your measurement is between sizes, or you are not sure which thickness fits your training. Compare the tradeoffs in our 5mm vs 7mm knee-sleeve guide.
Let us and the fitness community give you a hand! (or a knee?)
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