Lululemon Metal Vent Tech Half Zip Pullover Why we made this~ "Time to run. Powered by seamless construction, this ventilated, mid-weight half zip keeps air flowing from first to last mile." 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. Reflective details. Silverescent™ technology, powered by X-STATIC® , inhibits the growth of odour-causing bacteria on the garment. Preowned very good condition See pics for approx measurements Size Large 423