To cover around the side faces of body with a loop-shaped object itself by packing cold-proof cushion materials in bag-shaped front cloth, loop- shaping it with a specified cross-sectional diameter and selecting the size of loop-shaped object into dimension for wrapping the human body from the surrounding while lying on the back.

Cold-proof cushion materials 1 formed from cotton or sponge are stored so as to be packed in front cloth 2 formed in the shape of bag from woven or non-woven fabric. In such a state, the bag is formed to be loop-shaped with the cross-sectional diameter of about 20cm without applying any special outer pressure. The size of this loop-shaped object 3 is defined as the dimension for wrapping the human body from the surrounding while lying on the back. Then, that loop-shaped object 3 is placed on a mattress 5 and in this case, concerning the object linking operating strings 4, the positions connecting these operating strings 4 are set on the side of feet. Thus, since the loopshaped object 3 itself covers the body around the side faces, cold-proof operation can be provided.