If you plan on working out in the heat, the right gear and exercise apparel make all the difference. For the most optimal pair of workout shorts, it's key to look for breathable materials, moisture-wicking technology, activity-appropriate cuts and thoughtful extras (pockets or liners, anyone?). Gym shorts should fit comfortably and not feel restrictive, so you have total range of motion. Once you find your favorite, you'll wonder how you did without them. From short shorts to retro designs to longer biker styles, check out our round-up of the best women's workout shorts for your summer exercise routine. Go ahead–buy a pair and a spare.