Features of the Endura Pro SL Headband 4-way High stretch windproof panels protect critical Areas Luxurious Thermoroubaix? panels with PFC Free DWR M? treatment provide Insulation, comfort and water repellency Low profile U-form binding Ergonomic, pre-shaped panel construction Dark reflective trim Fabric Details Polyester 54% Nylon 27% Elastane 14% PU 5%