Product name:eva non slip children’s sandals, slippers, shark style material:eva soft and hard sole: relatively soft sole thickness: relatively thick elastic force: strong style: cartoon shark eva slippers are lightweight and comfortable eva materials have good elasticity and cushioning properties. it can effectively reduce the impact on joints during human movement, making exercise more comfortable. eva material has excellent wear resistance, can withstand long-term use and friction, and is not easily damaged. eva material has excellent chemical corrosion resistance and can prevent chemical erosion comfortable foot feel high friction coefficient size : 1. please choose the size according to your foot length. allow 0~0.5cm error due to manual measurement.2. usually, the inner length of the shoe is 0.4~1.3cm longer than the foot length, which is suitable. for example, if your foot length (heel to toe) is 24cm, please choose shoes size 38-39 in this model.3. if your feet are wide or thick, please choose one bigger. if you are not sure of the size, please contact us before payment. children size: foot length 14-15(cm) = size 150;foot length 15-16(cm) = size 160;foot length 16-17(cm) = size 170;foot length 17-18(cm) = size 180;foot length 18-19(cm) = size 190; foot length 19-20(cm) = size 200;foot length 20-21(cm) = size 210;foot length 21-22(cm) = size 220; adult size: foot length 23-24(cm) = size 36/37;foot length 24-25(cm) = size 38/39;foot length 25-26(cm) = size 40/41;foot length 26-27(cm) = size 42/43;foot length 27-28(cm) = size 44/45;