The Bugaboot Peak Boot pairs a bonded OutDry membrane with 400 grams of Omni-Heat Infinity insulation, so water stays out while heat stays in. The membrane bonds directly to the outer shell, closing the gaps where cold and moisture usually creep into a winter boot, and the reflective lining bounces body heat back rather than losing it to the outsole. A full-grain leather upper over an injection-molded shell keeps the boot protective without adding the weight that kind of coverage usually costs. What Our Gearhead(R) Experts Are Saying:"I've stood on packed ice in these without a slip, and it comes down to the fiber-rubber blend in the outsole finding grip where a standard rubber sole would skate. That traction is what actually lets the insulation do its job, since I'm not sliding around burning through body heat trying to stay upright."