KOKATAT activewear under shirt polypropylene and spandex long sleeve shirt with soft fleece like texture on inside. Thin but insulated and stretchy. mock turtleneck. I think it is a women's size medium but it could possibly be a men's medium (measures 17.5 inches from armpit to armpit not stretched sleeve inseam is about 21 inches) Pre owned in good condition see photos please!  

Preowned