Muck Book, Women's, Artic Sport II, Size 10. The Muck Boots Arctic Sport II Mid Cut Winter Boot includes a series of features that elevate it as a premier choice for any number of outdoor occasions. The inclusion of a Comfort Insole with Dual Density EVA Footbed and 5mm CR Flex-Foam will bolster overall comfort, while a Slip-Resistant Rugged Outsole will increase maneuverability. Versatility is improved to an even greater extent with the inclusion of a Warm Fleece Lining. The Muck Boot Arctic Sport II Mid Cut Winter Boot features a Comfort Range of -20 to 50F.