For the rider who needs stability and knee protection, the Knee Brace 6400 offers protection in a lightweight and comfortable package. The Knee Brace 6400, its bilateral support hinges use hyperextension stops to support and help prevent knee injury. Comfort comes from the X-Fit Strap System which helps prevent bunching that could restrict movement and create discomfort during track or slope runs. Adjustment: upper and lower compression straps for a customized fit. The thermoplastic protective kneecap is covered with an abrasion-resistant material for maximum durability and longevity. All this in a lightweight knee brace that feels at home on a motorcycle, mountain bike, snowboard, or skis.