Don't get the suds! Cover your feet with your new SpongeBob socks. Cool Socks Women's Crew Socks - Sponge Block are 70% cotton, 10% nylon and 20% spandex. Fits shoe sizes US 5-10. Socks are slim and lightweight with a light cushioned heel to ensure a secure fit. Machine wash warm & tumble dry low. Do not bleach or iron.