- Lightweight fiberglass shell - 23 Large freeflow vents with internal channels for maximum cooling. - Energy absorbsion and slip plane technology - Crash release visor system - Easy position visor, no bolts needed - Quick release liner for easy washing - Agion Bluesign approved antimicrobial treatment - Fidlock magnetic closure - Certified: CPSC Bicycle & ASTM F1952-15 (Downhill) Sizing: - Small = 55 - 56cm - Medium = 57 - 58cm - Large: 59 - 60cm - X-Large: 61 - 62cm - XX-Large: 63 - 64cm