Holyhigh Unisex Winter Outdoor Trapper Trooper Aviator Ski Hat Earflap with Mask Full Face and Neck Coverage Design. Protect you from Outdoor Sports in Cold weather. Best fit for 23"-24" head circumference, one size fits most. Detachable face mask, Ear Flaps can be Buckled Up or Down. Tested with face mask and ear flap down, it can keep warm at -30 Celsius degrees. Must-have for snow cleaning,snowboarding, skiing,hunting and other winter outdoor activity.