90% Nylon, 10% Spandex Truform 1923; Unisex support socks for frequent flyers, road trips; 15-20 mmHg graduated compression Soft microfiber texture; Reduces swelling in legs while traveling; Circulatory knit pattern Improves circulation and blood flow for extended sitting, to reduce swollen ankles, legs, calf, feet Tested by pilots; Great for all ages to prevent DVT and pulmonary embolism reaching the heart Made in the USA; Measure according to size chart; Latex-Free; Nylon Acrylic and Spandex construction