Suede/thermoplastic urethane uppers provide durable, waterproof coverage to protect feet from rain, snow, and rocky terrainWaterproof membrane seals out rain and snow; bellows tongue keeps debris outSynthetic polyester fiber insulation combined with fleece linings ensures warmth in cold temperaturesEVA midsoles provide cushioning; nylon shanks offer reliable arch supportSticky rubber outsoles provide great traction on wet or uneven surfaces; Merrell Air cushion in the heel absorbs shock and adds stability