This futon is thicker than a usual kake-buton (comforter) and it’s not as thick as a hada-buton. It is often used in the season such as spring and fall when the seasons change. You can respond to any temperature change as long as you have a set of a kake-buton, aigake-futon, and hada-buton. If the futons are sold in pairs or threes, each futon may have a snap button to attach the other futon.