Designed for extreme cold, the Nat's R917 12" Insulated Boot in Black keeps your feet warm in temperatures as low as -76°F. Featuring a 200 g Primaloft® insulated foam liner, it offers exceptional warmth without extra weight. Its lightweight construction ensures all-day comfort, making it the perfect choice for harsh winter conditions while maintaining the classic muk-luk style. Stay protected and comfortable no matter how low the temperature drops.