Made of high-quality PVC material it is very comfortable and will be especially comfortable to wear on your feet. The main material we use in our rain boots is natural rubber which is durable flexible and waterproof. The hand vulcanization process reduces the weak links in our rubber. Soft and comfortable rain boots especially for kids! Our boots feature soft materials for comfort. For size please refer to the actual foot length and size chart you can contact our customer service. Upper Material:PVC Sole Material:Rubber Toe Style:Round toe Heel High Style:Flat-Heel Closing Method:Slip-On Shoes Heel High:2cm/0.8 Platform Heigh:1cm/0.4 Included: 1 pair of shoes Size chart: Size:27 Insole Length:18.5cm/7.28 Suitable Age:6 Years Suitable Age:7 Years EU:30 UK:11.5 US:12.5 Suitable For:Little Child Size:29 Insole Length:19.5cm/7.68 Suitable Age:8 Years Suitable Age:9 Years EU:31.5 UK:12.5 US:13.5 Suitable For:Little Child Size:31 Insole Length:20.5cm/8.07 Suitable Age:9.5 Years Suitable Age:10 Years EU:32.5 UK:13.5 US:1.5 Suitable For:Big Kids Size:33 Insole Length:21.5cm/8.46 Suitable Age:10.5 Years Suitable Age:11 Years EU:33.5 UK:1.5 US:2.5 Suitable For:Big Kids Size:35 Insole Length:22.5cm/8.86 Suitable Age:11.5 Years Suitable Age:12 Years EU:35 UK:2.5 US:3.5 Suitable For:Big Kids Size:37 Insole Length:23.5cm/9.25 Suitable Age:12.5 Years Suitable Age:13 Years EU:37 UK:4 US:4.5 Suitable For:Big Kids