Perforated neoprene chassis for support and secure fit. Extended thigh protection // Impact resistant polyethylene knee cup is encapsulated in durable Aramid fiber for maximum coverage. Dual pivot system mimics anatomical action of the knee // Custom inverted post latching system. Asymmetrical design for comfort and fi. Sizing: Size S/M fits most riders up to 5'7" tall // Size L/XL fits most riders taller than 5'7".