This shoe size is based on leather shoe sizing. If you wear size 36 in leather shoes, choose size 36 for this model. If you wear size 37 in casual shoes, choose size 36 for this model (except for wide feet, wide instep, and high instep). Round toe design for comfortable fit without squeezing, delicate and not bulky, prevents thumb valgus. Soft sole and upper for comfortable walking. Comfortable heel design for even pressure distribution, minimizes foot fatigue. Grateful for parents in every step of life.