knockoffs have NO guarantee, You can, IF you order direct for MFR or Land End [I think they're the ones] and they don't work...can easily return them.
Price for the real Animals, vs the knockoffs is different yes, BUT, IF one calls the Crocs.com's -800# Telephone and actually SPEAK to a real person, which I did last year and got sound advice about the 'nubs' and what I mite and mite NOT need, well, the extra bucks were worth it?
Advice about sizing , fit, and neuro issues and tolerances made the $50 bucks of Crocs a lot cheaper than most other brands of diabetic specialty shoes by what, a $100 bucks less?
Earth Shoes are still around at WalMart and other places, not too bad, but for me, a 'princess fussy about 'peas' the stitching on these makes me crawl up a wall and back down again, and the Crocs don't have any stitching to complain about... E-S's have lots less of the 'old fashioned' leather 'give' than the originals had too...
Hope this humble person's opinion helps some out there - j