Join the committee with Itty Bitty! Understated and unsubtle at the same time, Itty Bitty is perfect accessory you need to help protect the health and well being of women everywhere. A portion of the profits from the sale of this sock directly benefit organizations that advance research into the prevention and treatment of breast cancer as well as advocate for women’s reproductive rights. Important facts about our socks: Unisex Sizing: Medium fits Men's US shoe size 3-9 and Women's US shoe size 4-10, Large fits Men's US shoe size 6-12 and Women's US shoe size 7-13 Fiber content: 39% Recycled cotton, 37% Recycled polyester, 19% Nylon, 3% Spandex, 2% Other Made in USA: Designed by two lovely ladies in Minneapolis. Knit in North Carolina.