borrowing from our premium headwear development, the FSTTShirt adopts a fully recycled COOLmatic | PLUS™ micro mesh for lightweight, quick dry as well as cooling and anti odour 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.