Compression socks give a measured, graduated squeeze, often 15 to 20 mmHg at the ankle. Support socks are gentler, unrated, and not built to reduce swelling.
You start a new job on a hospital ward, and someone tells you to "get some support socks" for the twelve-hour shifts. You pick up a multipack in the supermarket labelled "support", wear them for a fortnight, and your legs still feel like lead by the evening handover. The obvious conclusion is that compression doesn't work for you. The real problem is that you never wore compression.
"Support socks" and "compression socks" get used as if they mean the same thing, on packaging and in conversation. They don't. Support socks squeeze. Compression socks squeeze in a direction, firmest at the ankle and easing towards the knee, and that direction is what helps blood and fluid move back up the leg.
This guide sets out 15 differences between compression socks and support socks. It covers pressure, sizing, fabric, regulation, price, and safety, then shows which type suits your situation. By the end, you'll be able to read any packet and know which one you're holding.
What is the difference between compression socks and support socks?
Compression socks apply a measured, graduated pressure, stated in mmHg, that is highest at the ankle and decreases up the leg. Support socks apply a lighter, usually unmeasured squeeze that may be the same all the way up, or even tighter at the top. Compression socks are designed to help with swelling and heavy legs. Support socks are mostly about comfort and a snug fit.
The UK charity Thrombosis UK puts the problem plainly. It says that medical compression stockings are often confused with support stockings and flight socks. The same leaflet explains that support stockings don't meet the technical specifications of medical compression, usually don't need to be measured, and can even restrict blood flow because of "inverted" compression, meaning tighter higher up the leg.
The wording on the shelf adds to the confusion. "Support" can mean a lightly elasticated sock, a sock with arch support for sport, or a sock marketed vaguely for "tired legs". Some socks sold for diabetes go the other way and are deliberately loose so they don't press on the leg. None of these is graduated compression. If you've seen "support socks" and "supportive socks" used interchangeably, they're the same loose category.
Compression socks vs support socks at a glance
The table below sets out the 15 key differences. The sections after it explain the ones that matter most when you're choosing.
|
S/N |
Difference |
Compression socks |
Support socks |
|
1 |
Pressure rating |
Stated in mmHg, for example, 15 to 20 mmHg |
Usually no stated pressure |
|
2 |
Pressure pattern |
Graduated, firmest at the ankle |
Often even, sometimes tighter at the top |
|
3 |
Where they squeeze most |
Ankle |
Varies, often the cuff |
|
4 |
Pressure over time |
Designed to hold their pressure through their working life |
Often loosen and sag quickly |
|
5 |
Sizing |
Calf measurement and shoe size |
Shoe size or one size |
|
6 |
Fabric |
Nylon and a high share of spandex or elastane |
Often cotton-rich with a little elastane |
|
7 |
Length |
Usually knee-high |
Any length, from ankle to crew to knee |
|
8 |
Putting them on |
Firmer, with a turn-and-roll technique |
Pull on like an ordinary sock |
|
9 |
Main purpose |
Help limit swelling and heavy legs |
Comfort, warmth or a snug fit |
|
10 |
UK regulation |
Medical-grade pairs are registered with the MHRA |
Sold as ordinary clothing |
|
11 |
NHS prescription |
Compression stockings can be prescribed after assessment |
Not prescribed |
|
12 |
Safety checks |
Not suitable for some conditions without GP advice |
Few medical cautions, though tight cuffs can still dig in |
|
13 |
Replacement |
Replace every 3 to 6 months with daily wear |
Replace when worn out |
|
14 |
Price |
Around £30 a pair for medical grade |
Usually cheaper, often in multipacks |
|
15 |
What to look for on the pack |
mmHg figure, "graduated", MHRA registration |
Words like "support", "comfort" or "energising" |
How do compression socks and support socks differ in pressure?
The biggest difference is pressure. Compression socks state how hard they squeeze, squeeze hardest at the ankle, and are made to keep that pressure for months. Support socks usually do none of those three things.
Compression socks state their pressure in mmHg
Compression socks list their pressure in millimetres of mercury (mmHg), the same unit used for blood pressure. A pair labelled 15 to 20 mmHg applies that pressure at the ankle when it fits your leg. That's the level most people use for long shifts, travel and everyday tired legs, without a prescription.
Support socks rarely give a figure. You might feel a snug squeeze, but you can't know how much pressure it is or where it sits. If the packet doesn't print an mmHg number, assume it isn't compression.
Graduated pressure steers fluid upwards
Graduated compression is firmest at the ankle and eases off towards the knee. That pattern works with gravity, encouraging blood and fluid to move up the leg instead of collecting around your ankles by teatime. Thrombosis UK describes medical stockings as having graduated compression with less at the top of the stocking.
Support socks often squeeze evenly, and a tight cuff can make the top the firmest point. Thrombosis UK warns that support stockings can restrict blood flow because of that inverted pattern. A band of pressure under the knee and less at the ankle is the opposite of what tired, swollen legs need.
Medical compression is built to hold its pressure
Thrombosis UK notes that medical compression stockings keep their pressure up over the lifetime of the stocking rather than going saggy. Support socks, with less elastic in the knit, tend to loosen quickly and slide down the leg. With daily wear, even well-made compression socks need replacing every three to six months, and an NHS leaflet from North Cumbria says people need new hosiery every 3 to 6 months.
How are compression socks and support socks sized and made?
Compression socks are sized by calf measurement and made from stretch-heavy fabric, usually in a knee-high length. Support socks are sized like ordinary socks and come in any length and fabric.
Sizing by calf versus shoe size
Because the pressure depends on fit, compression socks are sized by the width of your calf as well as your shoe size. Thrombosis UK stresses that the level of compression is directly linked to your measurements. Our socks, for example, come in Small (UK shoe 3 to 6, calf 30 to 37 cm) and Medium (UK shoe 6 to 9, calf 36 to 43 cm).
Support socks are sold by shoe size or as one size. That's fine for comfort, but a sock that doesn't match your calf can't deliver a predictable squeeze. Our guide to how tight compression socks should be explains what a correct fit feels like.
Fabric and length
Compression socks use nylon with a high share of spandex or elastane, the stretch fibre that creates the squeeze. Ours are 80% nylon and 20% spandex. Support socks are often cotton-rich with just enough elastane to stay up, which is comfortable but holds sweat and relaxes faster.
Compression socks are usually knee-high, so they cover the ankle and calf where swelling builds. Support socks come in every length, from trainer socks to crew socks to knee-highs.
Putting them on
Compression socks are firmer to pull on. The easiest method is to turn the sock inside out down to the heel, slide your foot in, and roll it up the leg in stages. Support socks go on like any other sock. If a pair called "compression" slips on as easily as a sports sock, check the packet again.
Are compression socks medical devices and support socks not?
Medical-grade compression socks are medical devices in the UK, while support socks are sold as ordinary clothing. UK government guidance states that all medical devices must be registered with the MHRA before they can be placed on the market in Great Britain. That registration is what allows a seller to call compression socks medical grade.
Our knee-high compression socks are registered with the MHRA and give 15 to 20 mmHg of graduated compression. Support socks make no medical claims, so they don't need registration.
The NHS route is different again. GPs and nurses can prescribe compression stockings after checking your legs and circulation, usually in a specific UK compression class. If you're trying to match a bought pair to NHS guidance, our guide to the style of compression stockings the NHS suggests covers classes, lengths and knit types. Support socks aren't prescribed.
Should you buy compression socks or support socks?
Buy compression socks if your legs swell, ache or feel heavy after long periods of standing or sitting, or if you're travelling for hours. Buy support socks if you just want a comfortable, snug everyday sock and don't have those symptoms.
Compression socks make sense for:
-
Long shifts on your feet. Nurses, carers, retail and hospitality staff often end the day with puffy ankles. There's a reason so many nurses wear compression socks rather than general support socks.
-
Long flights and journeys. Sitting still for hours lets fluid settle in the lower legs. Our guide on whether flight socks are the same as compression socks explains what to check on travel socks.
-
Pregnancy swelling, once your midwife or GP has agreed.
-
Heavy, tired legs at the end of most days, where a GP has found no reason that compression would be unsafe.
Support socks are fine for warmth, light comfort, or arch support during sport, as long as you don't expect them to reduce swelling. If a podiatrist has recommended non-binding socks because of diabetes, follow that advice. Those socks are designed to be loose for a reason, and they aren't a substitute for compression or the other way round.
Is it safe to swap support socks for compression socks?
For most healthy adults, moving from support socks to 15 to 20 mmHg compression socks is safe. Compression presses more firmly on the arteries, nerves and skin, though, so a few people should check with a GP or pharmacist first. If a clinician has prescribed compression stockings, don't swap them for support socks, because support socks won't give the pressure you were prescribed.
Thrombosis UK advises against wearing compression stockings if you have:
-
Advanced peripheral arterial disease (PAD). NICE explains that the reduced blood flow in PAD can be worsened by compression therapy.
-
Heart failure, unless your care team has said compression is fine.
-
Loss of feeling in the legs, such as peripheral neuropathy from diabetes.
-
Infected phlebitis (an inflamed, infected vein) or an oozing skin rash on the legs.
-
An allergy to the stocking material, in which case another make may suit you.
Take compression socks off if you notice tingling, numbness, pain, or toes turning pale, blue, or cold. Our full guide on who should not wear compression socks explains each condition in more detail.
Frequently asked questions
Are support tights the same as compression tights?
Usually not. "Support tights" from the high street are often lightly elasticated for a smoother look or a little extra hold, with no stated pressure. Compression tights give graduated pressure measured in mmHg, and some are prescribed after an assessment, so check the packet for a figure.
Can support socks help swollen ankles?
Support socks may feel comfortable, but they aren't designed to reduce swelling and rarely state any pressure. Some are tightest at the cuff, which can make ankle swelling feel worse by the end of the day. For swelling, graduated compression socks are the better choice, as long as a GP has ruled out a medical cause.
Are flight socks support socks or compression socks?
It depends on the pair. Some flight socks are proper graduated compression with an mmHg rating, and others are simply snug socks with "flight" on the label. Check for a stated pressure, the word "graduated," and sizing by calf before you buy.
Do you need a prescription for compression socks in the UK?
No, not for 15 to 20 mmHg compression socks, which you can buy from pharmacies and online. Firmer compression stockings are usually prescribed by a GP or nurse after checking your circulation. Support socks never need a prescription.
How can you tell compression socks and support socks apart on the packet?
Look for an mmHg figure, the word "graduated," and a size chart that uses calf measurement. Medical-grade compression socks should also mention MHRA registration. Words like "support", "comfort" or "energising" with no pressure figure usually mean you're holding a support sock.
Which should you choose?
Compression socks and support socks look alike but do different jobs. Compression socks give a stated, graduated pressure, firmest at the ankle, are sized by calf, are made from stretch-heavy fabric, and in their medical-grade form are registered with the MHRA. Support socks give a lighter, unmeasured squeeze for comfort. If your legs swell or feel heavy after long shifts or long journeys, you need compression. If you have PAD, heart failure, neuropathy or broken skin, speak to your GP first.
Before you buy your next pair, turn the packet over and look for an mmHg figure and the word "graduated". Then measure the widest part of your calf in the morning, note your UK shoe size, and check both against the size guide on our MHRA-registered 15 to 20 mmHg knee-high compression socks.
