This is an Arena jersey, an Irish model. The size is M. Width (underarm) is approximately 53cm, and length is approximately 61cm. Please note that these measurements are approximate due to amateur measuring. There are stains and fraying as it is an old item. Please refrain from purchasing if you are sensitive to such issues. Those who understand and appreciate vintage clothing are welcome. I have other items for sale, so please take a look if you'd like.