Muck Arctic Sport II Mid. Womens. Gray Plaid, Size 10. These mid-height boots step up the warmth factor with cosy fleece lining and a 5mm neoprene inner boot for ultimate warmth in conditions as low as minus 40 degrees. The stretch-fit top-line binding keeps the boots snug to your legs to keep cold air out and warm air in. An EVA molded midsole offers support and the rugged outsole helps grip. Featuring a bioDEWIX antimicrobial footbed insert topcover with NZYM for odor control and moisture management. With a pull-tab for easy on and off.