Specifications: 1 shell 1) Adopt the structurally enhanced PC/ABS material, which has the feature of strong vibration-proof and high anti-impact ability 2) Surface is painted with imported paint material, which is with brilliance color, hard to color fade. 2. Cushion layer 1) With the innocuous material of high ability to absorb the impact. 2) The appropriate shape & size is suitable for wearing. 3.Extraordinarily comfortable whole inner liner 4.Secification:S(540-560mm),M(560-580mm),L(580-600mm) 5.The color according to customer\'\'s requirements 6.Could meet the US or European standards according to customers\'\' requirements