Thor Youth Sentinel Knee Guards. Co-molded ABS / TPU chassis delivers comfort and durability. Anatomical flush-mounted hinge design allows natural knee movement. Low profile design minimizes weight and optimizes fit. Light weight molded EVA foam interior liner for premium comfort. Strategic ventilation provides maximum cooling. Post-latching top closure with adjustable hook-and-loop strap. Stretch mesh calf-sleeve for cooling and comfort. Top closure and calf sleeve feature silicone print to ensure secure placement. Sold as a pair. Tested and certified according to European Standard EN 1621-1:2012.