Keep your knees healthy for years to come with the Troy Lee Designs Catalyst X Knee Braces. This set of left and right knee braces were designed in tandem with VQ OrthoCare to ensure medical grade protection for downhill mountain bikers and motocross athletes. With strong frames of 7075 aluminum, the braces are as light as possible without sacrificing protection. A number of specially designed support features and adjustments also help prevent old injuries from getting worse. A Tibial Docking System reduces shin pressure and improves rotational control while the full circumferential calf straps keep the braces from sliding up or down without being uncomfortable. Designed to protect against ligament injuries to your ACL, PCL, MCL, and LCL, the Catalyst X knee braces can't guarantee you won't do something crazy enough to injure yourself while wearing them, but they will certainly protect in most situations. The braces are slim and fit easily underneath your riding shorts or pants. If you're working with an old injury, these braces are adjustable to help you meet your physician's recommendations.