This VIM & VIGR Women's Cotton 15-20 mmHg Compression Sock is perfect for anyone in a medical environment. For long periods of standing get relief from pressure that can cause spider and varicose veins. 15-20 mmHg graduated compression Prevents swelling Alleviates achiness and heaviness Slows the progression of spider and varicose veins Aids in muscle recovery 200 needle-count for flexibility and comfort High-quality double-covered elastic fibers and premium cotton Listed with the Food and Drug Administration (FDA) Geometric Triangle print 48% cotton. 42% nylon 10% spandex