Excellent use condition. I probably wore this once or twice. I’m pretty sure this is the relaxed fit version of the swiftly tech based on how it fits. I do not know exactly what size it is. I am guessing a 12. There is a chance it could be a 10. Measurements Pit to pit 19 3/4” Top to bottom 26” From Lulu We designed this anti-stink long-sleeve layer with running (and sweating) in mind. silverescent® technology Silverescent® technology, powered by X-STATIC®, inhibits the growth of odour-causing bacteria on this garment anti-stink features Designed for: Training Ventilation: Mesh construction for breathability Relaxed fit, hip length: Layers easily and gives you room to breathe