Rooster Supertherm Wet Socks are made with 4mm Neoprene – designed to keep your feet SUPER warm! The superstretch neoprene outer allows these socks to span several shoe sizes making it easier for you to find the correct size – a closer fit means warmer feet! Inside the sock there is a super soft, grey marle, quick-dry lining which not only improves the thermal qualities of the sock, it also feels very soft and comfortable next to your skin.The sock is glued and blind-stitched to prevent cold water flushing, with a comfortable seam layout designed to maximize comfort.Features4mm superstretch neopreneGlued & blind stitchedPlush, thermal, quick-dry liningComfortable seam layoutWashing InstructionsWe recommend hand washing in warm water.SizingTo use the size chart, select your shoe size and find the corresponding sock size. The material exhibits some stretch and a single sock size will span a number of shoe sizes.SuperthermEU Shoe SizeUK Shoe SizeXXS/XS374385S/M39640.56.541.57.5ML/L42.58.543.59.54510.5XL/XXL4611.54713