The GripGrab Aviator Windproof Deep Winter Skull Cap is a skull-fitted, warm, windproof and breathable piece of headwear with excellent coverage of ears and forehead.Inspired by the headwear from the aviator era, we have created a skull-fitted construction that hugs the head. The technical design allows you to wear the Aviator comfortably under your helmet.The technical and ingenious construction offers a perfect combination of effective insulation with an ideal, comfortable design that will fit under most helmets.The Aviator Cap is the ultimate choice when the weather is rough and temperatures are below zero. A soft microfleece lining along with a carefully designed skull-fit makes the Aviator a pleasure to wear on your winter training rides.Soft and comfortable fabricWindproof frontHighly breathableFits under helmet