US Patent 9592149 Heat generating eye mask

A heat generating device includes a heat generating element enclosed in an air-permeable stretch bag. The heat generating element includes an air-permeable first side adapted to be located proximal to the skin of a wearer, a second side adapted to be located distal to the skin of a wearer, and a heat generating member interposed between the first side and the second side. It is preferred that a part of the heat generating element is fixed to a part of the inner side of the stretch bag in the overlap between the stretch bag and the heat generating element in a plan view of the heat generating device.