It is made of 100% natural rubber and naturally vegan materials, so it is safe for delicate children's skin. They come in a wide variety of colors, so parents and children can enjoy coordinating them. ■Material Sole and Thong: Natural rubber (made in Thailand) ■Size 5　　15.0 - 15.5 cm 5.5　15.5 - 16.0 cm 6　　16.0 - 16.5 cm 6.5　17.0 - 17.5 cm 7　　18.0 - 18.5 cm 7.5　19.0 - 19.5 cm 8　　20.0 - 20.5 cm 8.5　21.0 - 21.5 cm 【Notes】 1. About slime on the surface of flip-flops The cause of slime is silicone applied during manufacturing. It is applied to maintain the quality of the material. Please wash it with water once after purchase before use. Please be careful not to use it before washing with water, as it will cause the soles of your feet to slip. It may take some time for it to penetrate the sponge rubber and come off completely, but in that case, it will not bother you with the number of times you wear it. 2. Flip-flops surface scratches There may be marks on the surface of the sole that look like fine lines. This is not a defect because it disappears over time. Please check the image for details.