I'm 5'3, vary from small to medium on top, and I fit very comfortably into a medium in this shirt (I like my shirts a little on the looser side and shirt fits like so). I've bought 5 of these now in different colors. They last, they're cool and moisture wicking, and you can't not love the wheels. They can dress up or down - I've worn them hiking, biking, to work, and out to dinner with some jeans and a belt. My only comment is please keep making this print in many colors and I would love to see it incorporated into other styles - long sleeve, tank top, etc.