TPR safe anti-skid rubber sole.</br>Comfortable & Durable Construction</br>Great for Beginning Walkers</br>The inside length of sole is 16cm/6.3".Suitable for most 32-40months baby.</br>To make it comforable to wear. Please measure your baby's foot length before choose the size.</br><br/>http://www.amazon.com/gp/product/B01LMO6RHM