The Reaction series boasts temperature rated boots suitable for everyday winter wear. Baffin's proprietory inner boot layering guarantee this series to keep you warm during moderate to high activity in temperatures as low as -40C/-40F. With Baffin's base combination of ArcticTM Rubber, EVA and Polar Rubber, this series is a great multi-use choice for a winter boot.Temperature Rating: -40C/-40FLiner: Removable, Baffin multi-layer inner boot systemBase: Arctic Rubber Shell, EVA Midsole, Polar Rubber Outsole Double-weave, 900 Denier nylon upperDouble buckle system; locking snow collar