Design: 100% waterproof protection Constructed with Neo-Tech waterproof insulation to keep your feet warm and dry in wintery conditions Constructed with leather from a Gold Rated tannery certified by the Leather Working Group Heel pull loop for ease of entry In-Shoe Comfort: Rebound cushioning provides all-day comfort and energy return BLOOM eco-friendly, algae-based EVA footbed that helps clean polluted water habitats Additional Details: Comfort rated to 5°F/-15°C DuraFresh natural bio-technology activates to fight odors Built with recycled materials