Our Energy Compression Sock is the world's first graduated compression sock with an Easy On, Easy Off feature and now includes our NEW Arch Support Technology. Using a superior blend of new-age fibers, these compression socks offer a luxurious cushioned footbed to help absorb shock as well as a targeted compression band that gently hugs your arch and ankle to help reduce foot and leg fatigue. You get all the benefits of energizing graduated compression and so much more! Make sure to order the right size - Small/Medium fits Men's shoe size 6-9 and Women's shoe size 7-10; Large/X-Large fits Men's shoe size 9-12 and Women's shoe size 10-13. For extended sizes, measure inches around calf - 18"-20" 2XL/3XL, 20"-22" 4XL/5XL