– Breathable Airmesh™ lining – Stretch-fit topline binding snugs calf to keep warmth in and cold out MS-1 Outsole is rugged, aggressive and durable for maximum protection and stability – Added toe protection with a wrap-up bumper – 2mm thermal foam underlay added to the instep area for additional warmth – EVA molded midsole with contoured footbed – Reinforced toe – Double reinforcements on the instep, heel and achilles area – CR flex-foam bootie with four-way stretch nylon, 100% waterproof, lightweight, flexible and buoyant – Comfort range of -40° F to 60° F