EVS Sports – RS9 Knee Braces, including the RS9 Knee Brace in Black as a single Medium/Left unit and as matched pairs in Small, Medium, Large and XL. The RS9 is a low-profile hinged brace with a dual-axis hinge, an adjustable range-of-motion stop and a rigid thigh and calf cuff that ties the leg together above and below the joint. That geometry is what keeps a knee from hyperextending when a foot slips off the peg or a landing comes up short, and it resists the sideways twist that tears an ACL. The shells are molded to sit under a boot top and outside a sock liner without pinching, and the strap layout holds the hinge on the joint center through long motos so the brace does not creep down the shin. Replaceable straps, liners and hinge hardware keep a set of RS9 knee braces in service for years instead of one season. Sizing follows thigh and calf circumference, and singles are handed left or right while pairs cover both legs. Ride them with knee cups and the right sock height and the hinge stays put. Send us your measurements and riding discipline and we will confirm the correct EVS Sports brace size and side before you order.