Compression stockings are made in a variety of support levels, each of which is designed to address a different need. These levels are most commonly expressed in millimeters of mercury (abbreviated as mmHg). It's an old way of measuring pressure and for some reason, we still utilize this for measuring the pressure of a garment.
Generally, the pressure of compression socks is displayed in ranges. This is because a sock is a knitted garment and not rigid.
The higher the number within a given range, the tighter the sock will feel and the more support it will provide. For example, a 15-25 mmHg sock will offer more support and will be slightly tighter on your leg than a 10-15 mmHg sock.
We use 15-25 mmHg a.k.a." the compression sweet spot" because it provides all the benefits of a medical-grade compression sock without being uncomfortably tight.
Find out more about compression on our Journal here.