Aero helmet reduces resistance against wind 14 specially designed aeration slits guarantee excellent ventilation new comfort orientated micrometric adjustment system that can move up and down rear led safety light with multiple settings removable hypoallergenic and breathable mesh bug liner replacements available datatag ice label in case of emergency sunglasses removable chin strap lightweight aero mould design 250g 52 58 270g 56 62 size 52 58cm