This women's Irish polo shirt features European sizing: 8-10 = small, 10-12 = medium, 12-14 = large, 14-16 = XL & 16-18 XXL. European sizing runs about 2 sizes smaller than a regular adult unisex size. For example a size 12-14 (European large) is similar in size to an adult size small.
The ladies' Celtic sport shirt features a breathlite 2 layer fabric. The base layer keeps your skin dry by wicking moisture away and the outer layer keeps your skin cool in hot weather.