Stack your shelves and your sock drawer with these gray book stack socks! Perfect for readers, librarians, and anyone whose happy place includes a big, comfy chair and a bookshelf that always has room for one more. • Each pair provides books for children with Room to Read. • Certified Organic (GOTS) and Certified Vegan (Vegan.org). Made with fair trade manufacturing. • Knit with combed cotton yarn for a smooth feel, greater durability, and reduced pilling. Terry padding on the footbed for extra comfort. • Small fits women’s US shoe sizes 5-9, men's US shoe sizes 4-8, and EU shoe sizes 36-40. • Medium fits women’s US shoe sizes 9.5-14, men's US shoe sizes 8.5-13, and EU shoe sizes 41-47. • Best for: bookstores, coffee shops, museum gift shops, Fairtrade stores, and retailers looking for sustainable apparel. • They’re a thoughtful gift that gives back for book worms, book club hosts, and teachers, and are the perfect accessory for sustainable consumers or anyone who loves fun socks.