The compression sock review that starts from the physiology rather than the product: the deep vein thrombosis (DVT) risk on flights over 4 hours (the blood pooling in the calf veins from the seated position and the cabin air pressure — the clot formation risk elevated by the immobility, the dehydration, and the low oxygen partial pressure at altitude), the specific compression level that gives the DVT prevention effect (the 15-20 mmHg compression — the medical-grade class 1 compression, the compression that the NHS DVT prevention guidelines recommend for the long-haul flight), and the specific compression sock that gives the 15-20 mmHg class 1 compression in the form that the traveller actually wears for 11 hours rather than removing at boarding.
Reading time: 5 minutes | Last updated: 2026
The Compression Level Explained
Compression socks are rated by the pressure they apply at the ankle (mmHg — millimetres of mercury):
- 8-15 mmHg: The mild compression — the comfort sock, the travel sock that reduces the swelling without the DVT prevention effect.
- 15-20 mmHg (Class 1): The moderate compression — the DVT prevention range, the NHS recommended level for the economy class long-haul flight.
- 20-30 mmHg (Class 2): The strong compression — prescribed for the venous insufficiency and the post-surgical DVT prevention. Requires the medical assessment before use.
The travel sock should be 15-20 mmHg. Below 15 mmHg: comfort without DVT prevention. Above 20 mmHg: requires the medical prescription in the UK context.
The Three Socks
1. Sockwell Circulator — The BGGD Recommendation
What it is: The 15-20 mmHg graduated compression sock (the Merino wool and bamboo blend — the natural fibre giving the moisture management that the pure synthetic compression sock does not give over 11 hours, the graduated compression (the highest pressure at the ankle, decreasing up the calf — the direction that encourages the venous blood return against gravity)):
The travel comfort: The Merino/bamboo blend gives the temperature regulation (the fibre absorbs and releases moisture without the synthetic saturation) and the odour control (the Merino wool’s lanolin gives the natural antimicrobial property that gives the sock the 2-day wear before washing).
Price: £18-25 per pair.
2. Sigvaris Traveno — The Medical Standard
What it is: The Sigvaris Traveno (the Swiss medical compression sock brand — the 15-20 mmHg class 1 compression, the medical-grade knit, the specific sock that the NHS compression stocking prescription uses):
The specific Sigvaris advantage: The consistent mmHg delivery — the Sigvaris manufacturing standard gives the 15-20 mmHg range accurately, whereas the fashion compression sock’s claimed mmHg often varies from the measured delivery.
The appearance: The Sigvaris Traveno is available in the dark navy, the black, and the grey — the medical sock in the travel-appropriate palette.
Price: £15-20 per pair.
3. CEP Travel Compression Socks — The Athlete’s Choice
What it is: The CEP (the compression equipment brand used by the endurance running community — the 20-30 mmHg compression, the graduated knit, the specific sock that the marathon runner uses for the recovery):
The caution: The CEP standard product is 20-30 mmHg — the class 2 medical compression that the GP prescribes for the post-surgical patient. The traveller without the venous condition should use the CEP Travel Compression Socks specifically (the 15-20 mmHg version marketed for the travel use) rather than the standard CEP.
Price: £30-40 per pair.
The DVT Prevention Beyond the Sock
The sock reduces but does not eliminate the DVT risk. The complete prevention approach:
Move every 90 minutes: The aisle seat gives the movement without the disturbance. The calf raise (the heel lift, 20 repetitions, performed at the seat) maintains the calf pump.
Hydrate: The cabin air at 8,000 feet cabin pressure equivalent is at 20% relative humidity (the desert air). 250ml of water per hour of flight.
Avoid alcohol: The alcohol accelerates the dehydration that elevates the DVT risk.
