neoprene Imported 3mm Terraprene neoprene w/ Titanium laminate adhesive Glued and blind stitched seams Neoprene HydroCuff MicroPlush inner lining, 3 Panel Construction NRS Neoprene Boundary Socks with HydroCuff - No more soggy feet when getting in and out of your boat. Boundary Socks are waterproof and warm, perfect for wearing with sandals or in a boot as added protection against wet and cold. At 18' tall this 3mm neoprene sock with a titanium laminate adhesive provides protection from cold water. Glued, blind-stitched and fully taped seams prevent water from seeping through the material, keeping you dry and warm. The three-panel construction is comfortable when wearing in a sandal or other shoe. The neoprene HydroCuff(tm) creates a comfortable seal around your calf keeping the sock up and helping to seal out water. When launching from shallow waters your feet with never be wet again!