I purchased these boots 3 years ago and I am in love with them.  They are so comfortable and warm.  I have worn them for 2 winters now and I am looking forward to another winter in them.  They are not slippery and my feet never get cold wearing them.  I walk outside for 60minutes every day (even when it is bitterly cold) and I have always relied on these with very little problem.  They are really cute too and I get a lot of compliments on them from people who are shocked that they are crocs.