Shunsoku's Ashi-iku (Foot Education) Series Sizes: 17 cm, 17.5 cm Set of 2 pairs. These shoes show signs of use, but they can still be used as spare pairs for daycare or similar. Please understand this before purchasing. Ashi-iku Series: The "Ashi-iku Series" was developed in collaboration with the Biomechanics Laboratory of the Department of Sports and Health Science at Juntendo University. It promotes healthy feet that are less prone to problems through "natural walking."