Active Ventilation with 15 Active Vents In-Mold Shell Construction Goggle Ventilation Channel Expedition Fleece on Liner and Ear PadsIn-Shell 360 Boa Fit SystemFidlock Snap Helmet BuckleCertification: CE 1077B ASTM 2040 Weight: 500g Fit: In-Shell 360 Boa Fit System SizeSimple Fit Audio AcceMIPS System