To provide an implement for keeping the body cool, easy to mount, smoothly suitable for a body bent portion and capable of easy movement of the body bent portion during mounting.

Three independent cells filled with keeping-cool agent are connected to one another from side to side to form a cell set. The cell sets are arrayed in two lines up and down to form an upper cell set 1a and a lower cell set 1b. An upper center cell C1 and a lower center cell C2 located at the centers of the upper and lower cell sets have the relative edges connected to each other in an approximately straight line. In mounting on a body, the connection 2a is arranged where a body is bent at the maximum. Each of the independent cells is in an almost rectangular shape in a plane view. Expansive strings 4, 4 for mounting on the body are provided between both ends of the upper and lower cell sets 1a, 1b.