Waterproof leather uppers. Fleece thermo insulation lining for warmth and comfort. Inside zipper for easy on and off. 200g Merrell M Select WARM™ lightweight, low-bulk, synthetic insulation keeps you warm in varying conditions. M Select DRY seals out water and lets moisture escape keeping your feet cool and dry. Molded nylon arch shank for improved stability. Merrell ActiveHeat™ insole with silver reflective film for added warmth. Merrell air cushion in the heel provides shock absorbency and stability. M Select GRIP tuness each outsole with durable traction.