Support hose, also called compression stockings, apply graduated pressure to your legs to push blood back toward your heart more efficiently. People wear them for a wide range of reasons: to reduce swelling during pregnancy, prevent blood clots on long flights, manage chronic vein problems, recover faster after exercise, or simply get through a long shift on their feet without heavy, aching legs.
How Support Hose Work
The stockings squeeze tightest at the ankle, with the pressure gradually decreasing as the fabric moves up toward the knee or thigh. This pressure gradient does two things: it narrows the diameter of your leg veins so blood moves faster, and it prevents blood from pooling or flowing backward through weakened valves. The result is improved circulation back to the heart, reduced fluid buildup in the tissues, and better lymphatic drainage.
There’s also evidence that compression increases oxygen delivery to your tissues. One study using near-infrared sensors found that tissue oxygenation improved while wearing the stockings, particularly at higher compression levels. Separately, research on patients with active venous ulcers showed that compression therapy reduced inflammatory markers in damaged tissue, which helps explain why the stockings do more than just manage swelling.
Reducing Swelling and Leg Pain
Chronic venous disease is the most established reason to wear support hose. When the valves in your leg veins stop working properly, blood pools in the lower legs, causing pain, heaviness, itching, cramping, and visible swelling. Compression therapy is the standard first-line treatment for these symptoms. Clinical data shows that even low levels of pressure (10 to 20 mmHg) can reduce edema, improve how well your leg muscles pump blood upward, and shrink distended veins when you’re standing. Higher pressures further improve venous emptying, which matters for more advanced vein disease.
For people who have already healed from a venous leg ulcer, wearing support hose consistently is one of the best ways to keep the ulcer from coming back. A Cochrane review of eight studies found that high-compression stockings reduced the risk of ulcer recurrence by roughly half compared to no compression. The tradeoff: stronger stockings are harder to put on and less comfortable, so people tend to stop wearing them. Lower compression stockings had higher compliance rates but offered less protection. Finding the right balance between effectiveness and wearability is key.
Preventing Blood Clots During Travel
Long flights are one of the most common reasons otherwise healthy people reach for compression stockings. Sitting for hours with your legs bent slows blood flow in the deep veins, raising the risk of a clot forming. A Cochrane review of airline passengers found that wearing compression stockings reduced the rate of symptomless deep vein thrombosis dramatically. In low-risk travelers, the rate dropped from about 10 per 1,000 passengers to roughly 1 per 1,000. In higher-risk travelers, it fell from 30 per 1,000 to about 3 per 1,000.
The stockings also significantly reduced leg swelling after flights. Superficial vein clots trended lower in the compression group as well, though that finding didn’t reach statistical significance. If you fly frequently or have additional risk factors like obesity, recent surgery, or a history of blood clots, compression stockings during travel offer meaningful protection for minimal effort.
Support During Pregnancy
Pregnancy puts extra pressure on the veins in your pelvis and legs, making swelling and varicose veins common, especially in the second and third trimesters. Research on pregnant women who wore 20 to 30 mmHg compression stockings starting at 12 weeks of gestation found that they had significantly smaller increases in calf and ankle diameter compared to those who went without. Every woman in the compression group reported noticing a difference in leg symptoms and said she would wear them again.
The vein protection may go deeper than comfort. One study using Doppler ultrasound found that none of the 30 pregnant women in the compression group developed reflux (backward blood flow) in their major leg veins by the end of pregnancy, while 16 of 30 women in the control group did. That reflux is the beginning of varicose vein disease, so wearing support hose throughout pregnancy may help prevent lasting vein damage, not just temporary swelling.
Standing or Sitting All Day
Nurses, teachers, retail workers, hairstylists, office workers, and anyone else who spends hours in one position can benefit from support hose. Gravity works against your veins all day, and without regular movement, fluid accumulates in the lower legs. Research confirms that even light compression in the 10 to 15 mmHg range is effective at preventing this occupational edema. A systematic review concluded that this light pressure level reduces both measurable swelling and subjective complaints like heaviness and fatigue, and that higher pressures don’t necessarily add benefit for people with healthy veins.
Stockings in the 15 to 20 mmHg range offer a step up for people who find that lighter compression isn’t enough. Both levels are available without a prescription and come in styles that look like regular dress socks or tights.
Exercise Recovery
Athletes and recreational exercisers increasingly wear compression socks during or after workouts to reduce muscle soreness. A study on adults who wore compression socks during a graded exercise test found that soreness, tightness, and pulling sensations were 35 to 42% lower at 24 hours and 40 to 61% lower at 48 hours compared to exercising without them. The effect sizes were medium to large for most recovery measures.
The performance side of the equation is less impressive. The same study found no meaningful differences in heart rate, blood lactate, or perceived exertion during the actual exercise. Compression socks don’t appear to make you faster or stronger while you’re working out, but they do help your legs feel better afterward. If you’re training frequently and soreness between sessions limits you, that recovery benefit alone may be worth it.
Compression Levels Explained
Support hose are categorized by how much pressure they apply at the ankle, measured in millimeters of mercury (mmHg). Choosing the right level depends on what you’re using them for.
- 10 to 15 mmHg (light): Suitable for everyday comfort, mild swelling from sitting or standing, and travel. No prescription needed.
- 15 to 20 mmHg (moderate): Good for more noticeable occupational swelling, minor varicose veins, and tired legs during pregnancy. Also available over the counter.
- 20 to 30 mmHg (firm): Commonly prescribed for moderate varicose veins, significant edema, DVT prevention in higher-risk patients, and use during pregnancy with vein problems. Often requires a fitting or prescription.
- 30 to 40 mmHg and above (medical grade): Used for severe chronic venous disease, venous ulcer prevention, and advanced lymphedema. These require a prescription and professional fitting.
Materials and Comfort
Modern support hose have come a long way from the thick, beige stockings most people picture. Current fabrics include moisture-wicking polyester blends, plant-based fibers like Tencel that perform well in warm weather, and wool for thermal regulation. Some medical-grade stockings incorporate silver-coated threads to reduce bacterial growth and odor, which matters when you’re wearing them for eight or more hours a day.
Knitting technology has also improved. Manufacturers can now create garments with different compression zones built into a single stocking, combining firm pressure in areas that need it with more breathable, flexible zones elsewhere. High-performance moisture-wicking fibers originally developed for athletic wear are increasingly used in medical compression products, making all-day comfort more realistic than it used to be.
Who Should Not Wear Them
Support hose are not safe for everyone. The most important contraindication is severe peripheral arterial disease, where the arteries supplying your legs are significantly narrowed. An international consensus statement identifies an ankle-brachial index below 0.6 or an ankle blood pressure below 60 mmHg as strict cutoffs where compression should not be used. At those levels, the external pressure can reduce already-compromised blood flow enough to cause skin breakdown or tissue death.
Other conditions that make compression risky include severe diabetic neuropathy (because you can’t feel if the stockings are causing damage), advanced heart failure, and confirmed allergies to the stocking materials. Even with milder arterial disease (an ankle-brachial index below 0.9 but above 0.6), the effect of the stockings on blood supply should be monitored carefully. If you have any of these conditions, compression should only be used under medical guidance.