Hello Kitty Baby Rattle Socks with Non-Skid Bottom, 12-24 Months Hello Kitty rattle socks encourage babies to reach, grab and kick, stimulating their sense with sounds. Designed with non-skid bottom, and extra protective inner lining. Super cute colors and patterns. Perfect for 12-24 months old babys. Machine wash in cold water. Tumble dry low. Do not iron.