I purchased the grey and black scrunch leggings In XS. I am a very small person but I wishI would have maybe gone up one size. A lot of the reviews said that they run bigger. I believe that they run a little smaller or are pretty true to size. Although the leggings run a little on the smaller size they still have plenty of room and do not feel like they are cutting off circulation. These leggings are not the best for doing squats… they feel like they could pop but great for going to gym or cycling class to look great. Thanks for the great leggings