The terms used to describe the socks  - massage-in-motion, graduated compression, etc are great in theory - but reality may differ for each person. I find the socks to be too long and there was nothing graduated about the compression - it was as if someone had my calf muscles and ankle in a bench vise. On a very long flight, it provided moderate comfort - but walking periodically and stretching will do the same. Overall, unless required medically, this does not seem to be a product whose effectiveness can be predictable until actually worn. For me, at least, it didn't satisfy. (nor has another brand of compression socks)