This is brand new size large it’s 100 percent authentic Metal Vent Tech SS 2.0 1. The Metal Vent Tech collection, powered by seamless construction, is the ultimate gear for running and training Our seamless construction uses the fewest number of seams to create gear that glides across skin so you can ship the chafe 3. Added elastane improves stretch and shape retention 4. Silverescent™ technology, powered by X-STATIC®, inhibits the growth of odour-causing bacteria on the garment 5. Mesh construction for breathability 6. Slim fit 7. 100% of the polyester in this product is recycied