It’s a kimono-like futon with sleeves attached. It has a form which is similar to a hanten (a kind of a kimono-style short coat) with extended sleeves. It can cover the shoulders entirely, so it was used especially in cold climates in the past. Kaimaki came to hardly be used because of the growth of blankets or heating appliances, however, a “kaimaki-moufu” made of materials for blankets is still popular.