What is the difference with the wide models?...
What is the difference with the wide models? How can I measure or check to see if my foot is a regular width or wide?
Based on the fact that you don't know if your foot is regular or wide, means its regular. If you have never had to get wide shoes then you're fine getting the regular. Now, if you have bought wide shoes in the past out of necessity, then you may want to go wide.