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What “graduated” actually means, what the mmHg numbers are, and how to choose — in plain English.
Most people meet compression hosiery for the first time when a GP or midwife suggests it, and almost nobody explains what the numbers mean. Here is the whole thing in about four minutes.
A graduated garment is firmest at the ankle and eases as it rises. That gradient is the entire point: it gives blood returning to the heart a mechanical assist in the right direction.
A garment that squeezes evenly — or worse, tighter at the top — does nothing useful and can act like a tourniquet. This is why a tight ordinary sock is not a substitute.
mmHg (millimetres of mercury) is the pressure measured at the ankle. Higher is firmer:
| Range | Level | Typically for |
|---|---|---|
| 8–15 mmHg | Low | Tired, aching legs; light swelling; first-time wearers |
| 15–20 mmHg | Medium | Everyday support, standing work, travel, maternity, mild varicose veins |
| 18–24 mmHg | Class 2 | Venous insufficiency, more pronounced varicose veins — usually clinician-recommended |
| 20–30 mmHg | High | Diagnosed venous disease, lymphoedema, post-thrombotic management |
Knee high suits most people and is the easiest to get on. Thigh high and tights are for swelling or veins above the knee. Above-knee garments are not automatically “better” — the right length is the one that covers the affected area.
Put them on first thing, before you get out of bed, while the leg is at its narrowest. Turn the garment inside out to the heel, place the foot, then roll it up the leg — do not drag it. Rubber washing-up gloves give grip and prevent nail damage. If you struggle, ask us about donning aids.
Compression is not right for everyone. Check with your GP before wearing it if you have peripheral arterial disease, uncontrolled heart failure, diabetic neuropathy, or any skin infection or open wound on the leg.