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How to Size Knee Sleeves
A knee sleeve that slides, pinches, or distracts you mid-workout is not doing its job. The right fit gives you warmth, compression, support, and confidence when the workout gets ugly.
Why Knee Sleeve Sizing Matters
At RBST Gear Co., we believe your gear should disappear once the timer starts. You should not be thinking about your sleeves during squats, lunges, wall balls, or heavy barbell work. You should be focused on the next rep.
Properly fitted knee sleeves help support the joint, keep your knees warm, and provide confidence under load. Poorly fitted sleeves slide down, bunch up, restrict movement, or become another problem to manage.
How to Measure Your Knee
Do not guess based on your clothing size. Knee sleeves are compression gear, and the right size starts with measurement.
Use a soft measuring tape and measure around the knee according to the brand sizing chart. Most brands measure around the center of the knee joint, but some may measure slightly above or below the knee.
Once you have your measurement, compare it to the sizing chart and choose the size that matches your training goals.
Should You Size Up or Size Down?
Size Down If
- You want maximum compression
- You focus on heavy squats
- You do Olympic lifting
- You prefer a locked-in feel
- You do not mind a tighter fit
Size Up If
- You do functional fitness
- You train longer metcons
- You run, jump, and transition often
- You want comfort with support
- You are new to knee sleeves
What a Good Fit Should Feel Like
A properly sized knee sleeve should feel snug, supportive, and secure without causing pain or restriction.
Good Fit
- Firm compression
- Warmth around the knee
- No major gaps or wrinkles
- Stays in place during movement
- Supports without distraction
Bad Fit
- Numbness or tingling
- Sliding during squats
- Bunching behind the knee
- Extreme pressure marks
- Restricted movement
5mm vs 7mm Knee Sleeves
5mm Sleeves
Best for functional fitness, metcons, general strength work, running, jumping, and mixed training. They offer a strong balance of support and mobility.
7mm Sleeves
Best for heavy squats, Olympic lifting, powerlifting, and athletes who want maximum support under load. They provide more compression but may feel warmer and more restrictive.
The RBST Recommendation
If you are between sizes, choose the smaller size for heavy lifting and maximum compression. Choose the larger size for functional fitness, Hyrox-style training, longer workouts, and better all-around comfort.
Serious athletes do not choose gear based on ego. They choose gear that helps them perform.
Frequently Asked Questions
Should knee sleeves be hard to put on?
They should take some effort to put on, but they should not cause pain, numbness, or circulation issues.
Should I size down in knee sleeves?
Size down if you want more compression for heavy lifting. For functional fitness and longer workouts, true-to-size or slightly larger may feel better.
Are 5mm or 7mm knee sleeves better?
5mm sleeves are better for mixed training and mobility. 7mm sleeves are better for heavy lifting and maximum support.
Why do my knee sleeves slide down?
Your sleeves may be too large, worn out, or not shaped well for your leg. A proper fit should stay in place during squats, lunges, and wall balls.
Can beginners wear knee sleeves?
Yes. Knee sleeves are useful for beginners, intermediate athletes, and advanced athletes who want warmth, compression, and confidence during training.
Can I wash knee sleeves?
Yes. Hand washing and air drying are recommended to help protect the material and reduce odor.
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