Borealis Peak is naturally insulated with a recycled coffee bean composite that traps and returns body heat to keep your toes cozy. Enhanced by salt-resistant leather and diamond lugs underneath for trustworthy traction on snow and ice. Full grain, waterproof, and salt-repelling Snowplow Leather upper with synthetic trim Seam-sealed waterproof construction Waterproof coffee based charcoal fleece lining releases heat back to the body and provides natural anti-odor/anti-microbial properties Faux Fur collar: 70% acrylic + 30% polyester Biomechanically designed & molded upper form-fits to Chaco LUVSEAT™ dual density EVA midsole with 10% recycled content for superior fit without separate footbed Non-marking ChacoGrip™ rubber compound 3 mm lug depth Excellent condition !