The Zan Headgear® Sport Flex™ Series Fleece Lined Beanie provides comfort & extra warmth. Flat seams in order to fit comfortably underneath helmets or alone while providing coverage of the head & ears. Features Fabric is brushed for ultimate softness 4 way stretch for customizable fit 50+ UV Protection Fleece Fleece is a synthetic fabric made from polyethylene terephthalate or other synthetic fibers. It is primarily soft & provides warmth through thermal insulation. It is also lightweight & durable, making it a great choice for performance wear.