Well, Theisen's is where I get mine 😁

I've got some danner winter boots. My carolinas seem to outlast them. I'll look up the birkenstocks. Thanks.

It's always been a trade off for me. Damage from Lyme disease kinda fried the nerves in my feet. If I don't get a broad toe or extra wide it just kills me. If I get something that is wide enough then 75% if the time they are too big in the heel and rub blisters. Toe fitment is my priority, if inserts or insoles are needed that just what I have to do. If I could find another brand that fit as good as the Carolina broad toe is love to try then, but haven't found anything close yet.

I put insoles in everything I wear. For the pain it causes me from getting my toes crunched I'll forgo arch support and buy inserts.

I have a similar shoe issue. Those shoe sizers put me in a 12 length, 14 by width. Can't say they'd be bifl, but carolina broad toe might help with the fitting issue. Daily use, farm, outdoor, in the shop and I'll get 1.5-2 yrs out of a pair.