• STAY-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