ACLIMA WoolNet Original Singlet New price: ¥12,100 It has been used, but it's a tough product, so there are no issues with wearing it. However, please purchase if you understand that it is a used item. I am 169 cm tall and weigh 58 kg, and it fit perfectly. Regarding this product, the following is an introduction borrowed from the Hiker's Depot website: ------ By adding it under your underwear or cut-and-sew, it creates an air layer through the mesh. This wool mesh underlayer provides an impressive level of warmth that you wouldn't expect from just one extra layer. Because there is less contact between the body surface and the clothing, it effectively wicks away sweat and moisture from the body. Therefore, it also boasts a high level of effectiveness in preventing chills from sweat. The WoolNet Singlet is an iconic mesh underwear from Aclima. While the brand's "LightWool Sport Singlet" is positioned as underwear and cut-and-sew for spring and summer, WoolNet is primarily for fall and winter, offering high effectiveness in preventing chills from sweat, the odor-resistant properties of wool, and a high level of reliability as the final line of defense for maintaining body temperature. It is one of the best base layers for cold periods and cold regions.