| 摘要 |
An undershirt worn in a state of being substantially in close contact with a surface of an upper body of a wearer includes a main constituent portion made of stretchable materials that include a first-type material, a second-type material, and a third-type material. The first-type material has a straining force greater than a straining force of the second-type material, and the second-type material has a straining force greater than a straining force of the third-type material. In the undershirt, the first-type material is arranged in regions such that in each region the material covers at least a part of musculus triceps brachii. The third-type material is arranged in regions such that in each region the material covers at least a part of a lateral portion of musculus trapezius, at least a part of a superior portion of musculus latissimus dorsi, and at least a part of a medial portion of musculus deltoideus in a vicinity of scapula. The second-type material is arranged in regions other than the regions where the first-type and third-type materials are arranged. Thus, an undershirt is provided in which materials having different straining forces are arranged in regions appropriately, according to movements of the muscles during pitching and batting, thereby intentionally improving motions of the shoulders and the arms.
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