This is quoted from the Crocs.com site:
"THE PERFECT CROCS FIT.
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!
To insure that the strap is not pulling your foot into the front of the shoe, rotate the strap forward and determine if your foot rests comfortably in the foot bed and there is room all around your foot. If so, you have the proper size but the strap is too short. To alleviate this issue, work your fingers around the strap and stretch it as you go around being careful not to put excessive pressure on the rivet hole. Stretch the strap until it is just short of the back edge of the shoe. The resin material has memory and will stay at the proper length after one or two of these types of adjustments."
Hi, my shoe size is 25.4 cm that is 10 inches and I usually wear UK 9 shoes. I bought Crocs Specialist Vent II clogs that says UK 7 (US 8). Now as you said that toe shouldn't touch the front. However, in UK 7 my toe touches the front and it is a little bit tight I can say. I have now ordered the UK 8 size for the same crocs. My query is that won't bigger size make my toes slide all the way up or down as I walk wearing those UK 8 crocs? This is my first time using crocs and I have started thinking that maybe crocs are not my sport. Please help as I really love the crocs I got.