Go ahead, get sweaty. The Swiftly Relaxed collection, powered by seamless construction, is the ultimate gear for running and training. Skip-the-Chafe, Seamless Construction Minimal seams to reduce chafe Lightweight Mesh construction for breathability Added elastane improves stretch and shape retention 100% of the polyester in this product is recycled (excluding trims) Features Silverescent™ technology, powered by X-STATIC®, inhibits the growth of odour-causing bacteria on the fabric Wide hem prevents ride-up Size tag removed but there are 5 lines/bars which I believe is a size 12.