2 mm Neoprene, HydroCuff top Titanium laminate adhesive Glued and blind-stitched seams Anatomically correct left and right feet DWR coating, pairing snaps NRS Sandal Socks - The NRS Sandal Socks are a perfect solution for cold feet. They are made from a 2 mm neoprene with a titanium-laminate adhesive that adds maximum warmth with minimal bulk. Wear them with a pair of sandals or sneakers to add extra warmth without the bulk of a full-size wetsock.