Comfort Rated -100C/148F. Excellent for ice fishing snowmobiling, and other outdoor activivties. Fully waterproof, front shin protection, 1 inch snow cuff. Aggressive, long wearing outsole. Liner with reflective foil coating that keeps cold away from your feet. Wool felt blend liner makes the boot more comfortable. Polypropylene wicks away moisture from your foot while helping to trap heat in.