Columbia Bugaboot IV Review | Switchback Tested。Black/Phoenix Blue colorway Insulation: These boots are equipped with 200g of synthetic insulation to provide warmth in cold and snowy conditions. Thermal Lining: They feature Columbia\'s Omni-HEAT™ reflective lining, which uses a breathable material with small silver dots to reflect and retain body heat. Waterproofing: The boots are built with a waterproof seam-sealed construction to keep feet dry. Traction: They typically feature high-grip Michelin® rubber outsoles for traction on ice and mud. Comfort: The design includes a Techlite™ midsole for cushioning and high energy return. Temperature Rating: These boots are rated for temperatures down to -25°F/-32°C