How do I select my size? 1.Measuring your foot length. Make sure you're standing on a flat surface. Trace the outline of your feet on a piece of paper. Keep your writing utensil as perpendicular to the paper as possible so you get the most exact measurements. Once your feet are traced, use a ruler to measure from your heel to the tip of your longest toe. 2.Then use this shoe size chart to convert the length of your feet to a U.S. shoe size. Fox example: If you choose US 8.5. We will send size EUR 40. It comes with 25.0 cm insole length If you feet are fat, you may choose the bigger one Women's International Shoes Size Chart Foot length range=Size US=Size UK=Size EUR 20.0~20.8cm(8.50~8.66inch)=US4.0=UK2=EUR34 20.8~21.5cm(8.70~8.86inch)=US4.5=UK2.5=EUR35 21.6~22.5cm(8.90~9.06inch)=US5.5=UK3.5=EUR36 22.6~23.5cm(9.09~9.25inch)=US6=UK4=EUR37 23.6~24.0cm(9.29~9.45inch)=US7=UK5=EUR38 24.1~24.5cm(9.49~9.65inch)=US8=UK6=EUR39 24.6~25.0cm(9.69~9.84inch)=US8.5=UK6.5=EUR40 25.1~25.5cm(9.88~10.04inch)=US9.5=UK7.5=EUR41 25.6~26.0cm(10.08~10.24inch)=US10=UK8=EUR42 26.1~26.5cm(10.28~10.43inch)=US10.5=UK8.5=EUR43 26.6~27.0cm(10.47~10.63inch)=US11=UK9=EUR44 Allow 2~3mm differs Dear friends, we ask you to follow a certain set of size and color to buy your favorite product, thank you for your cooperation, I wish you a happy life! Note: 1 The fastest time that you receive the product: 4-7 Days:US/UK/Germany 5-8 Days:France/Belgium/Austria 6-9 Days:Australia/Denmark/Spain/Poland/Portugal/Finland/Italy/Czech Republic/Latvia/Lithuania/Romania/Slovakia/Slovenia/Ukraine 7-12 Days:Canada/Switzerland/Estonia 7-15 Days:Netherlands/Sweden/Norway 2 Please Contact us in time if you have any problem About the product.We can help you solve most of the troubles,then give you Good service. 3 If you are not satisfied with the product that exists damaged or you did not receive the product and so on, you can immediately apply for a refund, we will return your money.