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 27.1~27.5cm(10.67~10.83inch)=US12=UK10=EUR45 Allow 2~3mm differs Upper material: super fiber Sole Material: Rubber Inside material: ultra-fiber style: Casual Applicable gender: Female Popular elements: bow, shallow mouth, rhinestones Toe shape: round head Upper height: low help Heel shape: flat with Soles craft: viscose shoes Heel height: flat heel Wear Style: Sleeve / Sleeve Function: breathable pattern: plain Suitable for the season: winter, spring, summer, autumn Color: black, wine red, brown Size: 36,37,38,39,40,41,