If the call of high mountain streams and the path less traveled ring true for you, our Flyweight Boot offers an incredibly lightweight design to help you answer the high-mountain call. The low-profile design maintains full wading boot functionality and the Vibram® Idrogrip outsole sticks to wet, mossy rocks, and is reinforced for reliable stud and cleat retention. Low-profile, lightweight synthetic boot upper Welded TPU film in high abrasion zones for durability Speed lace hooks and lace-toe closure High cushion dual density EVA midsole for comfort Stud and cleat-compatible 4.5 mm Vibram® Idrogrip rubber outsole Sizes 7 - 14 Simms Shoe USA Euro UK CM 7 7 40 6 24.4 8 8 41 7 25.4 9 9 42 8 26 10 10 43 9 27 11 11 44 10 27.9 12 12 45 11.5 28.6 13 13 46 12.5 29.4 14 14 47 13.5 30.2