These insoles make your shoes stay drier and breathe more odor free. For Shoe Sizes Worldwide: US and Canada Women's 6.5 to 12, Men's 5 to 11 - Europe 37 to 44 - Mexico 4.5 to 9 - Japan Women's 22.5 to 28, Men's 23 to 28.5 - UK Women's 4 to 9.5, Men's 4.5 to 10 - Australia Women's 5 to 10.5, Men's 4.5 to 10 - Russia and Ukraine 35 to 39 - Korea 238 to 273