A completely innovative, hybrid design capable of taking adventurers from Fall through Spring, BOREALIS modernizes the traditional hiking silhouette and winterizes its approach. Body-heat mouldable and designed for greater temperature regulation, BOREALIS allows for higher exertion in a broader range of temperatures and a moderate to high level of activity. Upper: Mid-height, specially formulated Thermoplastic Polyurethane (TPU) shell Front-lace fastening system Pull loop at the back for ease of entry Base: Dual-density midsole with LiteGrip(TM) Blend outsole for lightweight cushioning and grip Polar Rubber(TM) outsole for maximized grip and longevity of boot at cold temperatures B-Tek(TM) Scent-Free next-to-foot lining for keeping odours at bay Extended rubber tread to grip snow and ice Insulation: Removable Active-Fit Multi-layer inner boot system, with body-heat mouldable technology providing personalized performance and fit featuring: Thermawick(TM) comfortable, hi-wick next-to-foot lining material for greater breathability and improved thermal regulation Form-fitting B-Tek(TM) Foam lining for comfort B-Tek(TM) Lite proprietary aero-insulation blend that allows the inner boot to achieve greater thermal regulation while using less material B-Tek(TM) Heat lightweight, 4-channel hollow-fibre insulation for high-loft breathability in a broad range of temperatures PolyNylon(TM) blend used as an outer layer for lightweight and breathable liner durability