Flat seams 4 way stretch for customizable fit 50+ UV protection The ZANheadgear super soft SportFlex Series provides comfort and warmth. 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 and constructed of 87% polyester and 13% elastane.table.productattributes, .productattributes td { border-bottom: 1px solid #ddd; border-collapse: collapse; padding: 2px; text-align: left; }