Great invention to keep baby socks on for hours on end.
My daughter gets out of everything and wriggles her way out of every swaddle, socks, or just about anything tight.
These work great and are about the only thing she hasn't figured out how to take off.  The sock-ons work great over just any type of socks no matter how tick or thin.  I purchased the white ones and use over pink, white, yellow, black, etc regular socks.  They are tight enought to stay on but not to the point where they become constrictive to the baby's feet.  They are loose enough to not leave a mark on the baby's skin but tight enough to keep the socks on.  I've washed them several times and tossed them in the dryer as well by themselves without a mesh bag and they are just like new.  They didn't become un-done from the ends like many other products after several washes.  They are of great quality and deffinetly worth the investment.  I'm now ready to buy the next size up for my growing child.