OGIO ENDURANCE Long Sleeve Pulse Crew. OE321STAY-COOL WICKINGULTRA-BREATHABLEFLATLOCK SEAMS FOR COMFORTREFLECTIVE DETAILS, 4-ounce, 100% poly jersey with stay-cool wicking technology, Self-fabric collar, Reflective O heat transfer at back neck, OGIO Endurance heat transfer label for tag-free comfort, Set-in sleeves, Reflective stacked O heat transfers at sleeves, Reflective O Endurance heat transfer at back left hem