I needed good workout shorts that weren't too short (and not capris or longer in the summer). They are amazing! Perfect for what I wanted - not too short. My Zumba instructor even asked for them - she needs something that won't ride up on some of the fancier dance moves (can't do longer pants in the summer either). The side pocket is a bonus feature when I go to the gym - all I carry with me are my keys, phone and water bottle. I have size 6 jeans - small waist, fuller hips and thick thighs. The small ones are snug fitting (not too tight to be uncomfortable) but I feel like the medium ones would be too loose.