Toasty Feet features breakthrough technology developed for NASA. The advanced nonporous material in Toasty Feet has the highest thermal insulation value of any solid material available today, allowing it to block both heat and cold efficiently, while remaining light and thin enough to fit comfortably in almost any shoe or boot.Men's insoles fit sizes 8-12Women's insoles fit sizes 7-10Youth insoles fit sizes 3-7 Adult Men’s and Women’s Shoe Size Conversion Table M/W indicates Men's or Women's Sizes. Other systems are for either gender. System Sizes System Europe 35 35½ 36 37 37½ 38 38½ 39 40 41 42 43 44 45 46½ 48½ Europe Japan M 21.5 22 22.5 23 23.5 24 24.5 25 25.5 26 26.5 27.5 28.5 29.5 30.5 31.5 Japan M W 21 21.5 22 22.5 23 23.5 24 24.5 25 25.5 26 27 28 29 30 31 Japan W U.K. M 3 3½ 4 4½ 5 5½ 6 6½ 7 7½ 8 8½ 10 11 12 13½ U.K. M W 2½ 3 3½ 4 4½ 5 5½ 6 6½ 7 7½ 8 9½ 10½ 11½ 13 U.K. W Australia M 3 3½ 4 4½ 5 5½ 6 6½ 7 7½ 8 8½ 10 11 12 13½ Australia M W 3½ 4 4½ 5 5½ 6 6½ 7 7½ 8 8½ 9 10½ 11½ 12½ 14 Australia W U.S. & Canada M 3½ 4 4½ 5 5½ 6 6½ 7 7½ 8 8½ 9 10½ 11½ 12½ 14 U.S. & Canada M W 5 5½ 6 6½ 7 7½ 8 8½ 9 9½ 10 10.5 12 13 14 15.5 U.S. & Canada W
Adult Men’s and Women’s Shoe Size Conversion Table
M/W indicates Men's or Women's Sizes. Other systems are for either gender.