STAY-COOL WICKINGFLATLOCK SEAMS FOR COMFORTREFLECTIVE DETAILS4.3-ounce 80/20 poly/cotton jersey with stay-cool wicking technology OGIO heat transfer label for tag-free comfort Reflective taping under flatlock stitching at the shoulders Set-in sleeves Reflective OGIO Endurance vertical bar heat transfer on center back Reflective O heat transfer on front left hem