Choosing 15–20 mmHg compression stockings means measuring leg circumference for the right size, then matching that mild pressure to symptoms like achy or heavy legs.
Buy by looks or shoe size and you’ll likely get a sock that slides down by noon or pinches your toes. The 15–20 mmHg range is the workhorse zone — mild to moderate pressure sold over the counter for tired legs, light swelling, long days on your feet, and travel.
What Does 15-20 mmHg Actually Do?
15–20 mmHg is mild-to-moderate, graduated compression: firmest at the ankle, easing up the calf, helping move fluid up and out of the lower leg instead of letting it pool.
Sigvaris describes this band as everyday support rather than for serious venous disease — the level most people reach for on a busy day, a long flight, or standing shifts. Compression levels run low to high, each with a different job:
- 8–15 mmHg: light pressure for mild tiredness or post-exercise recovery.
- 15–20 mmHg: mild-to-moderate; the sweet spot for daily aches, slight ankle swelling, travel, and pregnancy-related leg discomfort.
- 20–30 mmHg and up: medical-grade, typically used under a clinician’s direction for diagnosed venous insufficiency, more pronounced varicose veins, or post-procedure needs.
If your legs ache and look puffy at day’s end, 15–20 mmHg is a reasonable starting point. If you have a diagnosis, see the caveats below.
How Do You Get The Size And Fit Right?
Size comes from circumference, not shoe size. Measure ankle and calf at their widest points, while your leg is not swollen, and match the product’s sizing chart — every brand runs differently, so “medium” rarely means the same thing twice. Measure first thing in the morning. Between two sizes, size up; too tight is worse than slightly loose.
To put them on: turn the stocking inside out to the heel, slide your foot in and set the heel, then roll the fabric up smoothly. Never pull from the top band — it stretches the fabric and stresses your hands. Rolling keeps pressure even and the cuff from digging in.
Fit varies enough between makers that reviews of worn pairs save trial and error. Our tested roundup of the best 15-20 mmHg compression stockings covers which hold their fit after repeated washes.
When Should You Put Them On — And Can They Backfire?
Put stockings on first thing in the morning, before swelling develops — once fluid settles, the stocking must work against gravity and is far harder to apply. On days you’ll sit or stand for hours, set them out the night before.
This level has real limits. Cleveland Clinic notes compression can be unsafe or needs medical clearance for certain conditions:
- Severe arterial disease or peripheral artery disease
- Swelling from heart or kidney disease
- Open wounds or skin infection on the leg
- Very fragile skin, or severely reduced sensation (neuropathy)
An NHS formulary advises a blood-flow reading called ABPI before starting full compression therapy. Where edema makes that reading impossible and there are no other contraindications, up to 20 mmHg may be used temporarily — a clinician’s call, not self-diagnosis.
Common mistakes: buying by shoe size or appearance, folding the top band down (a tourniquet effect), pulling from the cuff, and wearing them over damp or freshly moisturized skin.
Does 15-20 mmHg Cover Real Vein Problems?
For diagnosed venous insufficiency, more significant varicose veins, moderate swelling, or recovery after a DVT or procedure, this pressure is often not enough. Those situations typically need higher compression, fitted and often monitored by a clinician. If your legs are persistently painful, misshapen, or discolored, get an assessment before buying off the shelf.
| Your Situation | 15–20 mmHg Fits? | What To Do |
|---|---|---|
| Achy, heavy legs after work | Yes | Measure and buy OTC |
| Long flights or drives | Yes | Wear before boarding or departure |
| Pregnancy-related leg swelling | Often | Confirm with your provider |
| Minor ankle swelling | Yes | Size up if between sizes |
| Diagnosed venous insufficiency | Usually not | See a clinician |
| Peripheral artery disease | No | Get clearance first |
| Post-DVT or post-procedure | Rarely | Follow medical guidance |
15–20 mmHg handles comfort and prevention well, and steps aside for anything diagnosed.
FAQs
Can I wear compression stockings all day?
Yes, for this mild range. Most people wear them through a workday and take them off at night. Put them on right after waking, before your legs swell, and remove before bed unless a clinician says otherwise.
How do I know if the fit is wrong?
A poorly fitted stocking leaves deep marks, rolls down at the top, bunches at the ankle, or pinches your toes. A correct fit feels snug but even, with no pinching or sliding after an hour.
Can I wash them in a machine?
Wash by hand in cool water with mild soap, then air-dry flat away from heat. Machine washing and dryer heat break down the elastic; once the stretch goes, the pressure rating is meaningless.
References & Sources
- Sigvaris. “Compression Levels” Explains what each mmHg range is used for.
- Cleveland Clinic. “What You Should Know About Compression Socks” Covers uses and safety caveats for compression wear.
- National Center for Biotechnology Information. “Compression therapy for venous leg ulcers” Discusses ABPI measurement before full compression therapy.