Stretch-fit topline bindings snug calf to keep warmth in and cold out , Breathable Airmesh™ lining , Seamless, quick-clean rubber reinforcement , Added toe protection with a wrap-up toe bumper , 10mm kick rim for hands-free removal , Additional achilles reinforcement for added protection CR flex-foam bootie (5mm) with four-way stretch nylon, snag-resistant cover is 100% waterproof, lightweight, flexible, buoyant, and will form to virtually any calf girth , Comfort range 85° F to sub-freezing conditions |