Geez, how hard can it be for a company to put a proper size chart where consumers can see it.  I'm a man with size 11.5 (US) feet, a very common shoe size.  Their website size chart said I should have a Medium, perhaps a Large.  I ordered a Large.  Darn it, the Large didn't stretch the shoe whatsoever.

I have sent them back (kudos for having free returns), and ordered an Extra Large.  Something tells me they will be too big, at which point I'll lower my rating to a very frustrated 1 star.

The shoe trees are of very good quality, and the price is fine.  Just can't figure out why they struggle to offer proper guidance on size.