How do I know what width and size to order? What's my feet width and size?

For the Size you can view at the following: Size Chart

As for the width there are several widths signs which are different for men and women.
Most poeple already know their width sign (i.e. W, EE, 4E, etc.) However, if you're not sure about the right width (and even size) then the best thing to do is to order several widths or sizes! Now, don't worry about the payment because the shipping - and more important - the Return shipping are both free! this way you can try several boots at home, keep those you feel comfortable with and return the rest. In fact, this is a nice way to try also several designs, brands or colors.

It's part of the service and we strongly recommend it.