It's a sock in a book! Now you can introduce dirty socks to your collection. They make for a fun merchandising surprise when mixed in with a collection of clean socks. This wear and tear alternate version of the sock bookmark is sold exclusively to retailers. As seen on HBO. The sock makes an appearance in episode 3 of the reboot of Sex and the City, And Just Like That. LOL. Bookmarks are underrated... until you have a clean, single sock sticking out of a funny memoir or kid's classic. Bookmarks are printed double-sided with UV inks on a sturdy 24pt Cover paper stock. Packaged one per cellophane bag with scored hanger card closure.