As the name suggests, this is a square-shaped top. The design is based on the "Kantoui" (a garment that opens a hole in the center of the fabric to let the head pass through) that originated in the Yayoi Era. It uses Isemomen Cotton, a traditional craft from Tsu City, Mie Prefecture, which improves in texture the more it is washed. It is gentle on children's skin and comfortable to wear.