| 摘要 |
PROBLEM TO BE SOLVED: To make it possible to exhibit performance excellent in remedy for sweat by the materials to be used and a structure formed by combining these materials. SOLUTION: The back rest of the napsack is formed by combining the materials composed of lightweight foamed resins having elasticity as chief materials. A gap is assured between the napsack and the back by using such back rest. The temperature in the back is lowered by the flow of the air, by which sweating may be prevented. Further, the materials are the elastic bodies and have the nature to repel water and, therefore, there is no swelling by the sweat and there is no change in the material quality in spite of repetitive use.
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