Runner\'s World: \'As well as being comfortable and sweat wicking, the reflective yarn really does catch the light.\' Run Britain: \'The reflective yarn catches the light a treat\' T3: \'Proviz do excellent high-viz socks.\'\' Mid-length Double-width reflective yarn integrated at the cuff of the sock Lycra bands to optimise fitting Super thin construction for extra feel Air vent channel stitching on upper foot Extra lycra on arch for added support Blended material use: Polyamide (88%), Lycra (8%), Flash (4%)