I believe it's a breathable polyester material. This S-size Adidas T-shirt offers a comfortable fit. - Brand: Adidas - Size: S - Color: Gray/Black - Design: Raglan sleeves This is a sturdy, not thin, T-shirt with mesh in the armpits for functionality. The color scheme makes you look slimmer, and it's stretchy for easy movement. It has climacool technology. This is a used item, so please only purchase if you don't mind minor imperfections. No claims and no returns. Thank you for viewing. 1299 999