Specifically designed for women, the Muck Arctic Sport Mid is a comfortable way to keep your feet warm and dry during the colder seasons. Made with 5mm CR flex-foam bootie, this boot is 100% waterproof, is lightweight and flexible with four-way stretch nylon. The stretch-fit topline binding snugs leg to keep out the cold, while a 2mm thermal foam underlay adds warmth for a comfort range of -40º F to 60ºF. Double reinforcements on the instep, heel and Achilles area along with a reinforced toe and wrap-up bumper provide added protection throughout. The outsole is rugged, durable, two-color MS2 molded and contoured to fit a woman's foot.