Mac in a Sac Men's Active Lite Breathable Running Jacket 100% Polyester Imported Highly breathable (7000gsm) with back venting and water repellent lightweight unisex running or cycling jacket. High performance vaporlite fabric for enhanced breathability, featuring curved hem and reflective branding & piping. Concealed hood that folds away into collar, with adjustable drawcords to great fitting. Convenient chest map pocket for easy storage of essentials. Packs away into back pouch pocket (with handy belt/whistle inside!)