These are great leggings; a simple design and soft material. I always wear S but ordered S and M as some of the reviews said they run small. They don’t - they are a little tight to get on but once on are very comfortable and true to size. However there’s not that much difference between sizes, only really noticeable in the waist. Unfortunately the pair I received have a line/catch round the thigh and the size S is no longer in stock which is disappointing but Im going to keep the M as they are nice leggings. Luckily they have a drawstring so I can tighten or else I’d be pulling them up all the time. Also bought a second pair as a Christmas gift