The Kamik Ariel F winter boots are seriously impressive - they're certified sustainable and comfortable down to -4°F, which is pretty much as cold as most people will ever experience. The waterproof suede and genuine leather upper is seam-sealed to keep moisture out, while the moisture-wicking fleece lining and HEAT-MX sustainable thermal insulation work together to keep your feet warm and dry. They've got this chic hiking boot silhouette with both full lace and inner zip closures, so you can get that perfect fit and easy on/off. The faux fur cuff adds extra warmth and style, and the stitched back pull-tab makes them super easy to slip into. The leather is sourced from a tannery with a Gold Rating from the Leather Working Group, which is part of why these are considered sustainable footwear. The cushioned removable insole and odor-eliminating Cleansport NXT treatment mean they stay comfortable and fresh even with extended wear. The synthetic outsole has deep, self-cleaning treads that provide excellent stability on snow and ice. Measuring with about a 1-inch heel, 7-inch shaft, and weighing about 1 pound per boot, they're substantial but not overly heavy. Kamik has been making outdoor footwear since 1898, and their experience really shows in the thoughtful design and quality construction of these boots. Seriously, if you need winter boots that can handle seriously cold temperatures while still looking stylish and being environmentally conscious, the Ariel F delivers on all fronts.