You could buy any knee pads that are out there, but there are specific mountain bike knee pads that allow for a greater range of motion than your typical knee pads. We’ll look at your different options and as always we only review the best products for outdoor recreation. When buying a knee pad you want flexibility, but also durability, it has be sleek enough to not catch on the gear or terrain yet sturdy enough to allow you to skid or fall and protect your legs.
https://www.outdoorgearlab.com/topics/biking/best-mountain-bike-knee-pads
Fox Racing Launch D3O Mountain Bike Knee Guard, Medium, Black
- LAUNCH D30 KNEE GUARDS: The Launch D3O Knee Guards offer an excellent combination of impact-absorbing protection with a value-focused build
- D30: The CE certified D3O insert works seamlessly with the slip-on design to provide all-day comfort and confidence
- Order one size up. Guard runs small and should fit snug
- NONSLIP: Slip-on fit with hook and loop adjuster
- STAY DRY AND COOL: The moisture-wicking, open mesh design improves airflow and helps to reduce overheating hot rides
https://amzn.to/3aSFNHh
Leatt Knee Guard AirFlex Pro
- Super slim and lightweight, AirFlex impact gel protection
- Side and upper knee impact protection
- Pre-curved design for optimal fit and function
- Silicone printed, cupped knee grip
- Premium comfort using MoistureCool and AirMesh wicking fabrics
https://amzn.to/3jkqdZI
You might be tempted to buy something like this but don’t – https://amzn.to/3FY4hgJ
Bodyprox Protective Knee Pads, Thick Sponge Anti-Slip, Collision Avoidance Knee Sleeve (Large)
- 1 Pair Kneepads (Left and right), Unisex design, two sizes available. Polyester 45%/ Rubber 25%/ EVA 30%.
- Your Safety is Our Priority-made of high-density strengthen foam, good elasticity, breathable fabric keeps skin dry, and more comfortable.
- Ergonomic design, super lightweight, provides freedom of movement. An ideal knee protector for outdoor sports.
- Protect and Prevent knee injuries during exercise. Keep warm, prevention and reduction of stiff muscles and joints. Effectively impact proof, increase blood circulation.
- Great Grip, Non-Slip Feature! Easily put the knee pads on and forget that you had them on! That’s how comfortable it is whilst in use. No constant re-adjustment needed as it firmly hugs the knee!
$15.99 
Buy on Amazonhttps://amzn.to/3aSacFR
JBM Adult Youth Bike Knee Pads and Elbow Pads with Wrist Guards Protective Gear Set for Biking, Riding, Cycling and Multi Sports Scooter, Skateboard
- Suitable for Age 14+ years old.
- Multiple adjustable elastic straps fit for various knee girths.
- Made of tough and durable PP, PE materials with breathable Polyester sleeves to offer safety protection.
- Appropriate for Roller skating, inline skating and riding bikes and scooters and other extreme sports.
- Packge: Wrist guard x 2, Knee pad x 2, Elbow pad x 2.
$29.98
Buy on Amazonhttps://amzn.to/3lYpvmt
