This crew is 3.9-ounce, 100% poly jersey with stay-cool wicking technology (White is 4.6-ounce). With a Self-fabric collar and a reflective O heat transfer at back neck. It also features a reflective stacked O heat transfers at back. OGIO Endurance heat transfer label for tag-free comfort and modified, set-in sleeves. Reflective O Endurance heat transfer at right hem.