Uniqlo sports-type long-sleeved shirt, men's L size, similar to an undershirt like Under Armour. It's stretchy and quick-drying, so the seller used it as an inner layer for mountain climbing and as a rash guard in the summer. As shown in the images, there is some fraying of the threads, but there are no major scratches or stains that would affect its use. How about it as an undershirt for sports or a rash guard for water activities? Please be sure to read the profile before purchasing. (^^)