Clinically Proven to Reduce Risk of DVT Reduce swelling. Improve Circulation. Reduce risk of Deep Vein Thrombosis (DVT) Latex Free 76% Nylon 24% Lycra Spandex DVT can be prevented - Wearing OAPL Travel Socks during flight can reduce the likelihood of DVT forming by improving circulation. OAPL Travel Socks should be worn continuously whilst travelling. Creasing or rolling of the stocking during wear must be avoided. Size Small - Calf - 11.5"-14.50" (30-37cm) Length - Up to 15.75" (Up to 40cm) Medium - Calf - 13"-15.50" (33-39cm) Length - Up to 15.5" (Up to 42cm) Large - Calf - 14.5"-17.50" (37-44cm) Length - Up to 17.5" (Up to 45cm) X-Large - Calf - 17.5"-19.50" (44-50cm) Length - Up to 19" (Up to 48cm) Warnings Travel Socks may be inappropriate if You have severe arteriosclerosis You have skin inflammation jor ulcers You have recent surgical wounds Gross oedema Cardiac failure Gross leg deformities PLEASE CONSULT YOUR DOCTOR