Flat seams 4 way stretch for customizable fit 50+ UV protection The ZANheadgear SportFlex Series Fleece Lined Beanie provides comfort and extra warmth. Featuring flat seams in order to fit comfortably underneath helmets or alone while providing coverage of the head and ears. Fabric is brushed for ultimate softness and has a 4 way stretch for customizable fit. Provides 50+ UV protection, inside constructed of 100% polyester and outside is 87% polyester, 13% elastane.