Uniqlo U Heattech Cotton, crew neck T-shirt, black, size XL. It has a design with seams down the center of the back and on the sleeves, making it suitable to wear as a T-shirt. Please note that this is different from regular Heattech. Photos 6-8 are from the Uniqlo website. I purchased it but wore it only a few times and have been storing it at home, so please consider this if you are interested.