EVS Sports SX02 knee braces are a substantial upgrade over the SX01 series. They are engineered with bilateral polycentric (6061 T6) aircraft-grade aluminum hinges with customizable 15 degree incremental flexion/extension stops, to allow the rider to set the limits to specifically suit their needs for a custom fit. They feature lightweight and breathable Airprene construction with compression straps to keep the braces in place, and include a durable, protective knee cup. These braces will work on either the left or right knee, so they're great for BMX and/or mountain biking use.