Uniqlo Knit Vest, Gray 100% Cotton It's cotton, but it seems to be knitted with a sturdy yarn, so it can be worn for three seasons: autumn, winter, and spring. Crew neck Size S Shoulder width: approx. 33cm Body width: approx. 44cm Front length: approx. 56cm Back length: approx. 62cm I think it's designed to be worn a bit oversized for a relaxed fit. I can wear it normally, even though I usually wear size M. The back is longer, so it seems like it will keep your lower back warm. It's a simple gray color, so it's easy to coordinate with other clothes. There are slits on both sides of the hem. I didn't realize it had slits when I bought it, so I'm selling it. There are no noticeable scratches or stains, but it's not a new, unused item, and it's a used item, so please refrain from purchasing if you are concerned. Non-smoker, no pets, no interest in scented items. It will be shipped via Mercari's anonymous delivery service with compensation.