The Revolutionary NO Headache Visor by 3D Activewear does not pinch your head and it does not slide off your head. The springy fiberglass visor is wrapped in a nylon fabric and the arms are covered in a black neoprene fabric. These square brim visors extend 3-1/4 inches and are 6 inches wide and the dark underside helps to reduce glare. So light you hardly know it's on your head! One size fits most.