Abstract: An exothermic warmer (1) includes an exothermic element (11) that is covered with a first cover sheet (21) and a second cover sheet (22). The first cover sheet (21) is a sheet that is air permeable and does not substantially limit an oxidation reaction. A water-retaining material (12) is provided so as to be at least partially in contact with the exothermic element (11). The exothermic warmer (1) satisfies the following conditions (A) to (C): (A) the difference between the internal temperature of the exothermic element and the highest surface temperature of the exothermic warmer is 10° C. or less; (B) the highest skin temperature obtained when the exothermic warmer is applied to human skin is 38° C. or more and 42° C. or less; and (C) the ratio of the amount (mg/cm2·10 min) of steam generated in 10 minutes after the start of the oxidation reaction to the mass (g/cm2) of the exothermic element takes a value of 50 or more and 250 or less.

Abstract: A method for manufacturing a fine hollow protruding article (1) according to the invention involves: a protrusion forming step of bringing a projecting mold part (11) that includes a heating means into contact from one surface (2D) side of a base sheet (2) including a thermoplastic resin, and, while softening, with heat, a contact section (TP) in the base sheet (2) where the projecting mold part (11) contacts the base sheet (2), inserting the projecting mold part (11) into the base sheet (2), to form a protrusion (3) that protrudes from the other surface (2U) side of the base sheet (2); a cooling step of cooling the protrusion (3) in a state where the projecting mold part (11) is inserted in an interior of the protrusion (3); and a release step of withdrawing the projecting mold part (11) from the interior of the protrusion (3) after the cooling step, to form the fine hollow protruding article (1).