Borrowing from Ciele's premium headwear development, the FSTTShirt adopts a fully recycled COOLmatic|PLUS™ micro mesh for lightweight, quick dry as well as cooling and anti-odor technologies. Reflective details keep you lit from dusk to dawn. Engineered, always on side vents, keep things breezy. Flatlock stitching and critical welding alleviate much maligned chafing and elevate this essential run T to premium status.Details:Lightweight recycled COOLmatic|PLUS fabric finished with accelerated wicking and odor control AirSTACK venting at side for increased air circulation Machine washable Reflective detailing for night run visibility Ciele athletics™ million miles guarantee Weight 118 grams Designed for people who run