Patent ID: 8394134

Claim:
A heat generating device comprising a first side adapted to be located proximate to the skin of a wearer and having air permeability, a second side adapted to be located distal to the skin of the wearer, and a heat generating member located between the first and second sides, wherein the second side is provided with an adhesive layer for attaching the heat generating device to a garment, the second side has an air permeance of 30000 to 60000 sec/100 ml, the first side comprises a nonwoven fabric having an uneven surface, the nonwoven fabric has a first surface and a second surface and comprises a first fiber layer inclusive of the first surface and a second fiber layer inclusive of the second surface, the first and second fiber layers are partly bonded to each other, the nonwoven fabric has a number of protrusions and recesses on its first fiber layer side and a flat surface topography on its second fiber layer side, the heat generating member includes a heat generating sheet, the first surface of the nonwoven fabric defines the first side of the heat generating device, the heat generating device has a horizontal dimension extending in a horizontal direction, a vertical dimension extending in a vertical direction, upper and lower edges extending in the horizontal direction, opposing side edges extending in the vertical direction, and a shape elongated in the horizontal direction, and the adhesive layer is located in a region except a strip-shaped central region extending along a vertical centerline which extends in the vertical direction and reaches the upper and lower edges, an upper strip-shaped region extending along the upper edge in the horizontal direction, and a lower strip-shaped region extending from a center of the lower edge towards opposing directions along the lower edge in the horizontal direction, such that the upper region forms a flap with none of the adhesive layer located at distal ends of a length of the upper region in the horizontal direction, and the lower region forms a pocket with a portion of the adhesive layer located at distal ends of a length of the lower region in the horizontal direction.