I ordered these November 2010 for my son (then 7) to get him out of his summer sandals.  Well he has worn them every time we go out for probably 10 hours per week since then.  He wouldn't even let me take the  liner out last summer.  I finally convinced them they were to small but we could keep them for his younger brother after we washed the liner.  They washed up great and are ready for more wear ... although he says they still fit with the liner out.

My only complaint is you have to be real careful pulling the croc buttons off to remove the liner or you will break the plastic tab.