The Sorel Men's Blizzard XT Boot is an extreme winter boot for the snowiest, coldest winters. Rated down to -40°F, the Omni-Heat™ reflective lining inside the 9mm recycled felt liner is built to keep your feet plenty toasty. Frigid temperatures aren't meant to be taken lightly so a 25mm bonded felt frost plug at the midsole helps prevent the cold from moving up your body through the bottom of your feet. The exterior consists of a waterproof, PU coated, synthetic upper which cinches at the top via a drawstring barrel-lock to keep snow out when stepping into deep snowdrifts. Last but not least comes the iconic, vulcanized rubber shell, built for traction on snow, waterproof, and won't back down if you happen to kick a rock, stump, or ice chunk with the toe.