I now own 6 pair of Miz Mooz shoes / boots.  Actually 3 boots and now 3 booties.  The consistent thing about their products for me are the heel heights and material quality.  It's not like these are $500 boots (material quality wise) but they are pretty welll constructed.  They also look pretty cool and are very comfortable.  For these boots particularly - they are pretty true to size.  I wear a size 9 womens and I purchased a size 9 womens bootie.  I actually use Super Feet insoles in all my shoes and for my booties with miz mooz, I use the black Super Feet insoles because they are thinner and don't require me to go up a shoe size.  For summer wear, I'll be using those stocking like footies with a little cushion on the bottom and pretty much cover the bottom of the foot up to the heel and will cover my toes.  There was some slight rubbing that I didn't like when I wore these booties with no stockings or trouser socks.  Overall - great bootie and consistent product from Miz Mooz.