My two year old has to have a non slip surface on the bottom of his socks because we have pergo in the kitchen and wood flooring throughout the house (other than his playroom).  These fit really well and he doesn't slip in them, nor does he want to take them off all the time like he has other types (I assume because they are comfortable).  They don't last terribly long but he outgrows them about the time they start to look bad.  I would recommend this product.