The Baffin Cloud Low winter boot builds real cold-weather protection into a boot that stays light on the foot. A multi-layer inner boot system pairs a wicking Thermaplush layer against the skin with hollow-fiber B-Tek Heat insulation, delivering warmth comparable to 400g insulation without the added bulk that usually comes with it. A breathable nylon shell and B-Tek Dry waterproofing keep moisture and wind out through the coldest stretches of a Tundra-rated range. What Our Gearhead(R) Experts Are Saying:"I've worn these on ice-packed sidewalks and frozen trailheads and never felt like I was hauling a heavy boot around, my feet stayed warm the whole time, and the grip held on ice that's sent me sliding in other pairs."