I had heard people speak about how much they liked their Crocs, but it never really moved me enough to get a pair of my own.  When my cheap house shoes started to fall apart and I decided to shop for some more.  While walking in our unfinished basement or hard hotel floor my feet were uncomfortable because of the cheap and thin soles on my house shoes.  I decided to look for a pair with 'hard' soles.  I came across Crocs and decided to give them a shot.  I can not believe how comfortable these things are!  When I get home my feet remind me to put them on.  The Mammoths are nice and warm.  The cold from our concrete basement floor does not come up through the sole.  My feet no longer hurt when walking a lot hard surfaces.  I have even run outside to chase the dog down and never felt the gravel through the shoes.
Another nice thing is that in summer I can take the lining out.  I like these these things so much I bought another pair and a pair for my wife.