The ZANheadgear® super soft SportFlex Series provides comfort and warmth. Flat seams 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.50+ UV protectionMaterials: 87% polyester, 13% elastane. WARNING: Cancer and Reproductive Harm - www.p65warnings.ca.gov This warning is being provided to comply with the State of California's Proposition 65.