The hiking boot lug sole gives superior traction, in the water and on land 5 mm neoprene upper provides warmth and enhances ankle support Thick, 7 mm neoprene insole absorbs the shock to cushion the sole on unforgiving terrain YKK ankle zippers make the ATB easy to get in and out of Laces combine with a hook-and-loop ankle strap for an adjustable fit and increased stability NRS Workboot Water Shoes - A river boot so rugged and dependable Navy SEALs don't hesitate to lace them up. The NRS Workboot Water Shoes delivers superior traction and a thick neoprene construction to meet the demands of river professionals and rescue agencies across the globe.