Icebreaker Arctic Grip is one of the absolute best winter boots on the market. The upper is made of full-grain leather and has a zipper on the inside of the boot where it is sealed with an H2O blocker that prevents water from entering through the zipper. The insole is made of moisture-absorbent felt. Normal read Composite toe cap and soft spike protection Vibrams Arctic grip pro sole with Wet ice technology which makes the sole's slip resistance one of the best on ice and packed snow Insulated for −30 ° C with Win Therm insulation which uses an aluminum film that reflects back heat to the foot and which is up to 50% breathable, which also keeps the foot dry