This Under Armour men's Base. 2.0 shirt is a size XL. This shirt is made to keep you warm during the cooler months. It is designed to trap heat, but still be breathable and lightweight. Features scent control technology. Moisture wicking, and stretchable. 100% polyester. New with tags, but there is a small imperfection in the material in the back of the shirt near the collar dur to the security tag.