Xcel Drylock 5-mm Split Toe Boot (Black/Gum Sole, 13) Engineered, seamless Drylock ankle seals keep water out and warmth in ThermoCarbon heat-retaining lining made of bamboo charcoal infused fibers and recycled fibers UltraStretch neoprene ankle panel for easy on and off Glued and blind stitched Pressure Bonded taped seams Adjustable Velcro strap and pull loop are Pressure Bonded to boot for maximum durability