Crocs are supposed to fit your foot with no part of the shoe touching your foot when you stand with both feet on the ground. From their site...
" Crocs should not fit like other shoes:
They should fit very loosely.
The sides of your foot should not really touch the sides of the shoe.
Your toes should never make contact with the front of the shoe.
Once you have centered your foot on the foot-bed:
You should have about a 1/4 to 1/2 inch of space in front of your toes, behind your heel and when you lift the strap you should be able to comfortably get your finger between the strap and heel.
In other words the fit should be "loose".
I know that this goes against everything that you have ever been used to in a shoe, but these are the parameters that the shoe was designed to be worn under.
No Pressure points Ever!"
When we visited WDW, August 2007, my children wore their Caymans every day. My son had spots on the sides (near the rivet) where they rubbed so we put a bit of Body Glide right on those spots and it helped. I wore Crocs flip flops for the whole trip and loved them. I used Body Glide only on the spot where the shoe goes between my toes to be sure I would not have any rubbing.
Hubby did not wear Crocs (he wouldn't be caught dead in them
) but made good use of the Body Glide under his socks with his tennies. He has very sensitive feet and would up with zero blisters in 11 days.
All the Best!
Daneen