These are amazing! Thick enough that I feel secure wearing them in public outside of climbing and yoga, but still great for wearing under skirts/dresses. I am right between a size 2 and 4 (5'8, 122 lbs) and the extra small fit great. Also had plenty of length for my long(ish) legs! I prefer them for yoga and climbing, but I have run in them and they were great--I just prefer my nike running tights for running--but if you are looking for one pair of tights to do it all, I cannot recommend these enough!!!!!