Features High quality and safe construction Comfort and lightweight Adjustable magnetic buckle Thickened & Detachable inside Liner and Chin pad Size Package dimensions: 11.4 inches * 6.1 inches * 9.0 inches (29.00 * 15.50 * 23.00 cm) Package Weight:1.2 lbs (0.55 Kg) Size M: 21.26inches-22.44inches (54-57cm) Size L: 22.44inches-24.01inches (57cm-61cm) Weight of M size 0.61lbs (275g) Weight of L size 0.63(285g)