Before Vibram 5 Fingers exploded, there were shoes like the OLD New Balance 790s.  They had a thin sole, light weight top.  Air easily penetrated the shoe, in fact I didn't wear them in cold weather because of the heat loss.  Women loved 790s and rated them highly.

Then New Balance stopped making 790s while everyone bought thin-soled Merrels, Vibram 5-Fingers, etc.

Now the 790s back and New Balance made a mess.  This shoe is nothing like the old 790 with a thick, over-engineered sole.  If you loved the old 790, you might not love this.  Thanks, NB, for completely changing a product that your customers loved.