Shock Doctor Men's Ultra Shockskin Hockey Shirt Sleeve Lock is a patent pending design integrating elbow pad retention wrap from within the sleeve, eliminating the common problem of pad movements Exclusive Shirt pattern of Bio-Shape to match the curve and shape of an athlete's natural stance Shockskin Rib Impact Protection of integrated fabric and vented foam pads that move and contour with the ribs for ultimate comfort and protection AirFlow in four-way stretch mesh in chest, spine and under-arm zones provides maximum heat release and comfort Gripper Pattern on sleeve elbow area enhances performance of Sleeve Lock elbow retention design Sleeve Lock is a patent pending design integrating elbow pad retention wrap from within the sleeve, eliminating the common problem of pad movements