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