1 pair sockshop 40 Denier knee high Flight and travel socks Black 4-7 uk, 5-8 us 85% Nylon, 15% Elastane machine washable 1 Pair of ladies 40 denier knee high flight dvt socks by sockshop. Help to reduce the effects of deep vein Thrombosis. Ideal for long journeys by road or flying Helps tired aching legs, swollen ankles and reduces the risk of deep vein thrombosis Knee high socks with a compression factor of 14-18 Produced to British Standard BS6612. Made in the United Kingdom.