OutdoorMaster Full Face Mountain Bike Helmet for Men & Women-Two Removable Chin Pad Mountain Bike Helmet Grizzly, Ventilation Lightweight Racing Downhill DH BMX MTB Helmet (Azure Blue, Large) - Fit System - This mountain bike helmets for adults are suitable for head circumference of 57-62cm/22.44-24.40inch - Maximum Protection and Comfort: The mountain bike helmet with EPP collarbone impact system and chinbar shock pads.Stay Safe and comfortable in any condition - Lightweight and Breathable: Revolutionary injection-molded high-flow cooling ventilation channels- 27 vents,And it weighs just under 750g - Convenience: The MTB helmet with removable and washable comfort liner,and with two sets of D-rings of different thicknesses - Suitable For Goggles: Goggle-strap channel makes it easier to keep your goggles in place, Pivoting visor helps protect the wearers eyes from the sun, wind and rain