- This style has a padded heel cup for stability & comfort and a hook & loop closure at the instep for adjustability. The front portion of the Kirei features padded technical lining which provides comfort and absorbs moisture. 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.