Durable hand-lasted rubber and a four way stretch inner bootie. 100% Waterproof. Constructed with 7mm waterproof Neo-Tech. Easy-on pull handles. Internal midsole with rubber sponge delivers extra cushion and warmth. Non-slip and non-marking outsole. Aegis antimicrobial odor protection insole. Comfort rated from temperate to -40°F. 10” shaft. Circumference at calf 17".