STAY-COOL WICKING ULTRA-BREATHABLE FLATLOCK SEAMS FOR COMFORT REFLECTIVE 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 Heat transfer label for tag-free comfort Modified, set-in sleeves