These Baby Sandals are made of Genuine Leathers. ? DURABLE NON-SLIP SOLES that are GOOD FOR FOOT DEVELOPMENT. They are made with SOFT Wave pattern rubber sole. From size 2-5, we offer thin Rubber Soles that are good for foot development. From size 5-10, we offer thick rubber soles that are flexible and thicker for daily outdoor activities. ? PREMIUM QUALITY GENUINE LEATHER. Our leather are soft with flexibility. ? COMFORT - Cushioned Collar and Padded Insoles that provide extra comfort to walk outdoor. ? SHOES STAY ON BABIES' FEET. They come with Adjustable Buckle and Belt closure. ? SAFETY IS OUR TOP PRIORITY. The materials we use are audited and safe for children. ?These sandals run slightly smaller than our Mary Janes and signature moccasins. To ensure the best fit, please measure the kid's foot first. Add 5/8" (about 1.6 CM) to the foot length you just measured. Use the TOTAL and compare it with our Size Chart, and pick the nearest insole length (your TOTAL should not go over the Insole Length). Then see which size number it fall under. For example, some 7 months old baby girls are still in size 2. Some 18 months old boys may wear size 5 to 6 already.