I love this jogging jacket. Rest assured, I'll be ordering a larger size for next spring. I wanted to try it out first and it's perfect.
 The model is wearing a small in the photos. Her measurements are :
 + or - 31 inches across the breasts = Small
 + or - 33 inches across the breasts = Medium
 + or - 35 inches across the breasts = Large
 + or - 38 inches on the breasts = Xlarge
 + or - 41 inches across the breasts = XXlarge