Unfortunately, it's a given that at some point your knees will hit the ground. Keep your patella protected with the Six Six One Rage Hard Knee Guard. This knee guard features the protection of a hard cap to cover your patella, and, while this means a slight compromise in flexibility, you'll feel more comfortable with aggressive riding knowing that you're protected. The back of the guard is stretch mesh and perforated neoprene, which means minimal bunching when you pedal. The fabrics breathe to keep your moisture build up at bay. To hold the knee guard in place, the shape has been articulated to accommodate the curvature of your knee while pedaling. Hook and loop closures keep it from shimmying down your leg.