Aside from the range of widths Roger mentions, there's also a far more critical thing that new balance offers, a range of shoe lasts.
Unfortunately, and somewhat inexplicably, neither the shoes nor the shoe boxes themselves list the last used, but if you go to newbalance.com shoe lasts you'll find the specific descriptions of each last. Why new balance fails to better promote such a killer feature and piece of information is a true mystery to me.
When you click on the link for the last, it shows which shoes have this last.
This means, not only can you get the range of widths, you can learn which last or lasts fit your feet, and then buy shoes that are the same lasts.
I almost never seen this fact mentioned in reviews or articles about new balance shoes, for example, if you review the 814, which is PL-1 I believe, that's a very important fact to mention, that means that once you learn that the pl1 last fits your foot, you can basically assume that new models using that last will also fit your foot. I believe failure to consider lasts is why sometimes new models make new balance buyers upset, they fail to check which shoe last the model is, then find it doesn't fit, then complain that new balance changed something. This is also new balance's fault for not listing the lasts more prominently on the shoe and packaging.
New balance solved my lifelong struggle with finding shoes that actually fit my feet, and opened the door to much longer hikes for me, so I'm pretty appreciative of their efforts in this area. Took a lot of trial and errors and failures and boxes of badly fitting shoes and boots until I discovered this fact, Roger, I suggest in all future reviews bpl does on new balance shoes, this information is featured much more prominently, it's not stuff that is widely known.