Crocs are not like any other shoes. Well no that's not exactly true. The first time I laid eyes on a pair of Crocs I thought of the infamous Earth Shoes that were famous back in the 1970's.
But Earth Shoes fit one's foot like a regular shoe. Crocs on the other hand should feel very lose on your feet. The sides of your feet shouldn't touch the inner sides of your Crocs. Your feet should feel quite free at all times. And when you put your feet into a pair of Crocs there should be anywhere from 1/4 to 1/2 inch of room between the tips of your toes and the inside of the Crocs.
But Earth Shoes fit one's foot like a regular shoe. Crocs on the other hand should feel very lose on your feet. The sides of your feet shouldn't touch the inner sides of your Crocs. Your feet should feel quite free at all times. And when you put your feet into a pair of Crocs there should be anywhere from 1/4 to 1/2 inch of room between the tips of your toes and the inside of the Crocs.
This spacing holds true for your heels as well. If you put the Crocs on with the heel strap down, there should be enough room for you to easily fit your finger between the inside of the Croc straps and the heel of your foot.
Now having said all this I think there is one exception to these rules. And that is the Crocs Mammoth. This is the Crocs design that comes with an inner lining to keep your feet snug and warm in the cold months of the year. These fleece lined Crocs provide you feet with a snug, warm nest.