For matches when you need a little extra warmth, the Nike Dri-FIT Park First Layer kit provides coverage that won't cut down your speed. The stretchy fabric and Invisible Thumb Loops create a streamlined layer that moves smoothly below your kit. 100% POLYESTER. Invisible Thumb Loops stay hidden when not in use. Dri-FIT technology helps you stay dry, comfortable and focused. Raglan sleeves eliminate the shoulder seam to help you move freely.