1,Massive ventilation, 2,OEM,Open mould; 3,CE APPROVED; 4,High temprature resistance PV shell; 5,IN-MOULD bicycle helmet bicycle helmet, road helmet, Standard: EN 1078, CPSC.vents - 16dial turn ring fit systemblack EPS4 color PC shellbuckle-quick releaseStraps - Quick adjustheatsealed comfortable padding56-58cm,58-62cm Bicycle helmet-Inmould -BJL037