OGIO ENDURANCE Pulse Crew. OE320STAY-COOL WICKINGULTRA-BREATHABLEFLATLOCK SEAMS FOR COMFORTREFLECTIVE DETAILS, 4-ounce, 100% poly jersey with stay-cool wicking technology (White and Pace Yellow are 4.6-ounce), Self-fabric collar, Reflective O heat transfer at back neck, Reflective stacked O heat transfers at back, OGIO Endurance heat transfer label for tag-free comfort, Modified, set-in sleeves, Reflective O Endurance heat transfer at right hem