Sitting still for hours in a pressurised cabin slows the circulation in your legs. Blood pools in the lower limbs, ankles swell, and the risk of clots (deep vein thrombosis) rises — especially on flights over four hours.
Travel compression socks counter all of this, and you do not need a medical condition to benefit from them.
Why flights strain your legs
Several factors combine at altitude to work against healthy circulation.
- Long periods of immobility slow blood flow
- Low cabin pressure and dry air encourage swelling
- A cramped seat restricts the calf-muscle pump
- Dehydration thickens the blood
Choosing travel compression
For most healthy travellers, light graduated compression is ideal. If you have a vein condition, ask your specialist about a higher class.
- 15–20 mmHg suits most travellers for prevention
- Knee-high socks are enough for flights
- Look for graduated compression — firmest at the ankle
- Choose a breathable, moisture-wicking fabric for comfort
Medical note: if you have a history of DVT, recent surgery or a clotting disorder, speak to your doctor before flying — you may need a higher class.
Travel-day tips
Combine your socks with a few simple habits to arrive feeling fresh.
- Put your socks on before you leave for the airport
- Drink water regularly and limit alcohol and caffeine
- Flex your ankles and stand or walk every hour or two
- Keep them on for a few hours after landing while you recover
Pro tip: keep your compression socks in your hand luggage so a delayed bag never means an unprotected flight.
Need help choosing?
Book a free clinical fitting with our compression specialists. We will measure you, recommend the right class and ensure a perfect fit.