I would have given these 5 stars except for the strange sizing problem I had.  I had two people get them for me for my birthday from the SAME seller who shipped them quicker than expected etc...  These shoes are great for those of us who remember and loved the shape of the original EARTH Shoes of the 1970s! They are shaped the same - you know, like  our feet actually are shaped.  The liner is already looking matted down (i've only worn them a handful of times) - I got the oatmeal color liner as Mammoths are hard to find And I took what I could get in the colors I like thinking I could just replace the liners.  That is a definite minus for these shoes! I can't believe CROCS won't sell the liners! they'd really make a killing in them!  I'd have every color just to change up the look!  But the liner is very cozy and comfy. Another plus for the shoes are the soles - they are EASY to clean up! We have chickens and they walk about the yard and DO their stuff wherever.  As much as one tries to avoid the little landmines, it is pretty tough sometimes. The bottoms of these are VERY easy to clean; the spaces are such that stuff does not get caught in them.
To the sizing issue.  One pair my mom got - those are stamped Mexico on the bottom and they fit wonderfully!!  I am wondering though if these are seconds from the seller because they have a PEN mark on the shoe! it is on the side and does not show up really - but if they have been worn  before, or are factory seconds - why did I pay full price? With shipping it was over $50!!!  The second shoes came and they are stamped - China - and they are smaller!  the heel is lower on the back of my heel and slides off easily when i walk - the liner does not seem to fit quite right, like it is too small and jammed in it - and as the first pair it has a blemish on the side, but this is in the plastic itself like the mold messed up.  Again, paying full price for seconds - if that is what they are - isn't cool.  BUT being hard to find now, I am just happy to have them.
I am not sure why both size 8 shoes would differ so much in size, but it is like 1/2 size difference.  Not only in length, but in width.  That and the liner being scrunched in gets them 4 stars.  If this were a review for just the ones from Mexico, they'd get 5 stars!
For liners it seems there are patterns out there for knitting them if you google crocs liners.