i had a pair for the longest time and went on my son 6th grade class trip to disney and when i got home i realized i left my old ones in the hotel.  So i check to see if Amazon had them again, For a while they did not have them on the site.  So i brought a new pair,  the texture on the bottom is different them my old ones which were smooth  this took a little to get used to but now i wear them all the time.