Knit fabric is brushed on both sides for a soft feel. The top's lightweight design drapes over the body, keeping you comfortable with every step. Open-hole knit fabric uses data from hundreds of runners. It's placed in high-heat zones at the front panel to help keep you cool on your run. The top's knit structure forms the iconic Nike chevron at the front, nodding to the look of the Windrunner. Reflective elements A lightweight favorite returns with more breathability. The Nike 365 Top is made with runner-informed data for cooling in areas where you need it. It has the same soft feel you've come to expect, with design details that nod to the iconic Nike chevron. This product is made with 100% recycled polyester fibers.