The previous reviews mentioned mostly ONE size up from regular US show sizes. I decided to listen to ONE other reviewer who claimed they needed one additional size beyond that.
Since I have a wider foot than typical and it has been my experience with both Crocs and others styles that in general, they run slightly narrow and smaller, I heeded the advice of the reviews instead of getting a size 9 (my normal size), I grabbed a pair of 11  in the AllCast II Snow Boot, and they work perfectly for my width and a little long, but not huge.
I am so happy there are reviewers on Crocs website to help me navigate on sizing and product features. The negative reviews are VERY helpful to both me (and SHOULD be to Crocs manufacturing IF they even look at this). A big thanks to the Crocs designers for making a decent style currently fashionable. I LOVE the comfort.
Finally, as Crocs went to new operations management, I notice the pricing to be much higher. The pricing of other shoes. But they are not the same value proposition. With placing pricing rungs at that level, I want to believe that Crocs will work on R&D and build longer durability into their shoes. I will pay $30 for a unique pair, but $60 for Silicon?
These are not like other shoes,  Crocs: bring back pricing in reality - set them back to $30-$35, or improve the durability of the sole like the Walu style.