Columbia’s women’s sierra summette iii is a waterproof, insulated lace-up winter boot with faux-fur collar. There’s a reason that the sierra summette iii is a crowd favorite; this waterproof, insulated winter boot is warm, cozy and supremely good-looking. The techlite shell is not only flexible and protective, it’s also super lightweight to prevent fatigue. Inside, 200 grams of insulation wraps feet and toes in a toasty cocoon of warmth to keep you comfortable whether you’re helping the troops stack a snowman or getting out into the wilderness for some much deserved fresh air. 200 gram insulation rated to -25f/-32c.