sock ons clever little things that keep baby socks on! 3 pack, small, white (0-6 months) sock ons sock ons clever little things that keep baby socks on! 3 pack - white 0 - 6 months. sock ons are award-winning garments that keep baby socks on! they are worn over the sock and "lock" them into place with a patent pending design. sock ons are an ingenious and trendy solution to a very annoying problem and are an item that no baby (or sane parent) can do without!made of soft, stretchy material. 82% nylon 18% elastane. machine washable or cold water hand rinse and hang dry.