Whether we're hiking across the frozen tundra or just doing a regular winter hike We trust the Merrell Coldpack 3 Thermo Mid Zip WP boots for their superior construction waterproof and insulating as well as an aggressive rubber outsole. 200 grams of synthetic insulation keeps feet warm and the SOLARCORE airgel footbed blocks out the cold from below. Merrell waterproof membrane helps seal out water and snow , while waterproof leather and mesh upper ensure that our feet will remain dry but will retain the ability to breathe. Zipper design uses premium waterproof YKK zipper prevents water from entering the shoe and a molded rubber toe protects the front of the boot from freezing when the skin gets wet at temperatures below zero. Merrell air cushion in the boot's heel helps absorb shock and reduce fatigue , and the Super Rebound Compound midsole helps keep us moving through rough terrain.