Bought these for my 11 mo old that pulls off socks and then shares them around the town.  So far, he hasn't been able to pull these off, but I think they may also be more comfortable since he doesn't really try.  Learned yesterday that if going out in the cold, it's best to layer with a pair of socks.  Little one's feet were pretty chilly after being outside.  He hasn't started walking yet, so I'm not sure if they'll be too slick to wear once he's moving.  I'll still plan to use them on stroller rides though.