The Chi is a bootie with a unique contrasting swirl design. This style has a heel cup for support. The Chi has an inside zipper for accessibility and gore for adjustability. The Chi has a 3.5" shaft. Naot's removable, anatomic cork & latex footbed is wrapped in pampering suede and molds to the shape of the foot with wear. The Koru Collection features a 1" polyurethane sole which is extremely lightweight, durable & slip resistant. This collection uses a hand-sewn stroble construction making it strong and extremely flexible.