I made a mistake and bought a medium size because I didn't realize that there are probably two codes for the same underwear. I had bought one from a store in medium size and it fit perfectly, so I searched for it here, and they were described as low-rise. Since the composition was the same, I thought it would be the same and didn't pay attention, because the other one didn't seem low-rise to me either... I thought it would be the same. It's like I bought a small size and it leaves marks on my waist... When I first bought them, I searched on the internet and found the helios website, which had two codes, but it seems to have closed down and I can't find it anymore. So, to sum up, it's better to go to a store and see the size and code up close, and then order, because returns are not accepted for underwear.