I know, I know, another Crocs thread! I scanned thru the ones I could find and did not see my question specifically addressed. That questions is "Do they require a break-in period before they are truly comfortable and ready for the trek around WDW or are they fine right out of the box? I am looking at the Caymen style as they come in true sizes. I tried on Beach and the M was too short and the L was too long.