Flight socks for the prevention of deep vein thrombosis (DVT, economy class syndrome) on long haul flights. Deep vein thrombosis is a condition in which a blood clot forms in a vein in the leg. This clot may travel to other areas of the body, including the heart, lungs and brain, which can all be fatal. The condition is linked to long periods of inactivity, dehydration, cramped conditions and low pressure (such as that found in an aircraft cabin). These socks help to prevent DVT by supporting the leg veins, aiding normal circulation. It is also suggested that passengers on a long flight exercise their legs regularly, walk around the cabin, and drink plenty of water.