High-quality thermoplastic resin External Shell 2 Shell Sizes 3 Eps Sizes J.1.E.R. Emergency Cheek Pad Removal System Double D Retention System New Inner lining fitting for a better comfort removable and washable inner lining 8 Intake and 6 exhaust vents Peak extension included Sizes: Small Shell ( XS / S / M ) From 53 To 58 cm Big Shell ( L / XL / XXL ) From 59 To 63 cm ECE Certification - From 1380 Gr +/- 50 Gr