As you would expect from Oakley the MOD5 is packed with the best features and clever designs. Hybrid construction blends in-mould to keep the weight down and ABS hard shell in key areas for added durability. MIPS increases safety by reducing rotational forces during an oblique impact. Adjustable venting allows you to regulate the airflow by sliding the button on the top and the Boa sizing system provides a personalised fit by twisting the dial at the back. Coming with two interchangeable brims ensures you will get a seamless helmet and goggle integration.Size GuideSmallMediumLarge51-55cm55-59cm59-63cmClick here for more information on our Size & Fit GuideVenting: ActiveSizing System: AdjustableWeight: 580gConstruction: HybridSafety standard: EN 1077 Class B, ASTM F 2040 Additional SafetyThe MIPS Brain Protection System is a helmet integrated, low friction layer designed to reduce rotational motion transferred to the brain during an impact.VentingAdjustable active ventilation enables hot air to rapidly escape out the top of the helmet. If conditions turn, close the venting to keep your head warm and dry.Brim/goggle ventilation allows hot air to flow unobstructed from the goggle through the brim ventilation for better anti-fog performance.Sizing SystemThe Boa 270o fit system is a fully adjustable design and engineered to help deliver an exact fit.ConstructionHybrid construction uses ABS hard shell material to provide extra protection against major impacts and increased durability where you need it most, and in-mould elsewhere in the helmet to reduce the overall weight.