Articulated protector follows the movements of the knee joint. Impact resistant, ventilated thermoplastic shell with aluminum reinforced knee cup for superior energy absorption. Ergonomically designed to fit knee and the side of the bike with asymmetrical form. Removable impact resistant bio-foam padding with a comfortable Lycra liner. Adjustable hook and loop straps are strategically placed to prevent skin abrasions. Hinges are durable billet aluminum. Snap assembly for ease of cleaning. Sold as a pair.