Lululemon Mens Metal Vent Tech lightweight Half Zip pullover long sleeve Size medium Grey color Designed for Running Skip-the-Chafe, Seamless Construction(Click to Close) • Minimal seams to reduce chafe • Midweight • Sweat-wicking • Four-way stretch • Integrated open-hole mesh ventilation increases breathability • 100% of the polyester in this product (excluding trims) is recycled Slim Fit(Click to Close) • Designed to skim the body from chest to waist Product Features(Click to Close) • Reflective details • Silverescent™ technology, powered by X-STATIC®, inhibits the growth of odour-causing bacteria on the garment