Sole: The upgrade phylon soles are softer, lighter, The sole has more elastic and excellent anti-collision performance. Make sure that the tile or wood floor will not be scratched, and more importantly, your babys comfort, happiness and safetyInsole: Selected high-density memory foam insole ensure that baby's feet don't slide inside the shoe. Unique insole specially designed for babies, provide excellent cushioning and support, reduce pain when baby learning to walk and make baby's feet grow healthilyUpper: Premium quality cotton & nylon knitted upper, has excellent breathability, moisture wicking function, and keep baby's feet dry and odorless. Super Soft, Breathable and Comfortable fit all the year