These aggressive river boots will keep your feet warm and comfortable all day. We built the sole out of the world's grippiest rubber, Hypergrip, for unsurpassed traction. The supportive lug sole with a defined heel is rigid, yet flexible. These boots fully support the arch and securely lace down with a lace-lock closure system. A quick release, adjustable Velcro closure provides optimum ankle support while the 7mm insole offers cushion and shock absorption. The reinforced rubber toe box adds protection and stability. 3-mm Ultraspan neoprene upper helps keep the water out; internal 5-mm neoprene insole provides warmth. A removable insole, mesh drainage and a conveniently placed fin tab round out these outstanding river boots. And they float!