A sweatshirt that has evolved as a daily wear for Americans as a "sweat-absorbing shirt", reborn from a wool knit material to a cotton material with a loop-shaped brushed back. The military and military academies, which routinely train hard, were among the first to notice, and they were also handled at base shops scattered throughout the United States. The material is a material with peculiar flexibility because it uses a tubular hanging knitting machine that is knitted with uneven tension as it was at that time. The suture is made with a 4-needle flat seamer suitable for underwear, and the V-shaped gusset is sewn with a rib material placed on the body, commonly known as "tapping V". 100% cotton Machine washable Made in Japan.