I got 3 of these last season and wore them every day to run or exercise. They are the BEST workout shirts I have ever owned - the material is so comfortable and stretchy, quick-drying and moisture wicking. I can't say enough good things about them. Unfortunately the same shirt this year would easily accommodate me if I were 9 months pregnant or weighed 200 lbs more than I do. I am 5'5" and weigh 105 lb. I usually take XS/S. This is last year's version and you better buy them while they last. I have been searching everywhere to find them!