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: 75% Cotton/17% Nylon/8% Elastane Colour: Black, White; Size: UK 4-6 / EUR 37-39, UK 6.5-8.5 / -42, UK 9-11 / EUR 43-45