According to the size chart, I should be an XS. I am typically an XS or an XXS in leggings. After reading reviews that this runs small, I purchased a size small. It fits pretty good, I have a small waist so it’s always harder for me to find leggings in my size, however, I wouldn’t want to size down for these. These look great. My measurements are 30-23-34 for reference and I have muscular thighs. I am 5’5 and 120 lbs.