Two numbers decide whether compression socks work for you: the mmHg range and your calf circumference at its widest point. Get those right and almost any decent brand works. Get either wrong and the most expensive sock on the market will leave a welt, roll down, or sit in a drawer.
Pressure: start lower than you think
15-20 mmHg is a prevention level and where most people should start. It addresses leg fatigue and the general heaviness of a long shift on your feet.
20-30 mmHg is what published podiatric guidance points to for established swelling, chronic ankle oedema, visible varicose veins or a previous clot. That same guidance notes that while 20-30 is available over the counter, having a clinician confirm the indication and the sizing is recommended.
Here is the practical point nobody warns you about: 20-30 mmHg is significantly harder to physically get on. Starting there is the single most common route to deciding you hate compression socks and never wearing them again. If you are new to this, start at 15-20 and work up - the levels page goes through it properly.
Calf fit: measure, do not guess
This is where most of the misery comes from and it is entirely avoidable. Take a tape measure to the widest part of your calf, in the evening rather than first thing in the morning.
Then use the chart on the page you are buying from. Comrad publishes actual ranges - S 10-14 in, M 12-14 in, M Wide 14-16 in, L 15-17 in, L Wide 17-19 in, XL 18-20 in - and states a threshold: over 17 inches at the widest point, choose a wide-calf option. That is more useful than every brand that sizes by shoe size and hopes.
A sock that is too tight at the top is not “more compression”. It is a constriction at your calf with no gradient below it, and it leaves a mark. The wide-calf page has more.
Graduated, not just tight
A real compression sock is graduated: tightest at the ankle, decreasing up the leg. That gradient is the mechanism - it helps push venous blood upward against gravity. A sock with uniform pressure is a tight sock, not a compression sock.
Every product on these pages states a graduated range. Where a brand does not publish one, we do not list it.
Material: an odor decision more than a performance one
Merino blends do not smell after twelve hours in a closed shoe. Synthetic socks do. That is the honest headline difference, and it matters more than people expect in a clog.
Nylon holds its compression well, launders easily and costs less. If your feet sweat heavily, the trade-off is already made for you - though it is worth knowing that merino needs gentler laundering, which is its own cost.
Published fiber breakdowns are patchy. Sockwell publishes one for its Elevation line; Comrad publishes nylon for its 20-30 line and nothing for its 15-20.
Two details worth paying for
A seamless toe. This prevents the pressure point most compression socks create across the toes, which is a common reason people stop wearing them.
A light sole cushion. Genuinely noticeable when you are standing rather than running.
They are consumables
Compression degrades with washing. These are a rotation, not a one-off purchase - which is why multipacks make sense after you know a brand fits you, and why buying five pairs before wearing one is a mistake.
Practical laundry notes: wash cool, skip the dryer where you can, and do not use fabric softener - it coats the fibers and reduces both the elastic recovery and the moisture management.
