Light as air. Cool as a breeze. The TechKnit Ultra top incorporates advanced breathable and anti-perspiration technology to keep your mind focused on the road. Its advanced design is built to move, so you can move freely with every stride. Nike Dri-FIT ADV technology combines anti-perspiration fabric with advanced innovations to keep you dry and comfortable.Minimized seams for freedom of movement.Breathable mesh fabric on the chest, upper back and sleeves allows air to circulate to keep you cool while you run.Runner feedback helped us discover the areas most exposed to heat, for better ventilation in key areas.The mesh structure of this top forms the iconic Nike chevron on the front, paying homage to the 1978 Windrunner jacket.