I bought this in a free size, but it was too narrow and tight for me. (For reference, I am of average build.) Only tried it on. I think it's in good condition, but there may be oversights due to personal storage. Please understand. 。。。。。。。。。。 Size: Free Size. Flat measurement length: 31-33cm. Stretchy. The main material is natural bamboo fiber. Combining traditional craftsmanship and modern science and technology, natural bamboo fiber is extracted from bamboo. Utilizing the characteristics of bamboo, it has excellent antibacterial, deodorizing, breathability, and moisture-wicking properties. Also, since it is made entirely of natural bamboo fiber, there is no damage to the body. There is no specific top or bottom to the product, so you can use it as you like. It can also be used as arm warmers. Made of soft bamboo fiber material, it has excellent heat retention and flexibility, and can be used all season long. It is also breathable and very comfortable to wear. It has a soft feel and a snug fit that isn't too tight. Due to the cooling properties of bamboo fiber, it is very breathable. You won't feel stuffy even if you wear it for a long time. You can use it year-round as a countermeasure against air conditioning in the summer and as a cold protection item in the fall and winter. You can enjoy cycling and sports comfortably even in cold weather.