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. Thumbholes for warmth. Reflective O Endurance heat transfer at back right panel. Reflective O heat transfer at left hem. 4-ounce, 100% Poly jersey with stay-cool wicking technology.