So....review of the Dingo Outback boots.
There is no removable insole. I need extra arch support. I ended up returning the 6.5 and getting a size 7. That left just enough room for the thinner version of protalus insoles.
I have now been wearing these pretty much every day for 6 weeks. LOVE LOVE LOVE them. Good thick sole that is comfortable walking or standing on all sorts of terrain. Nice for riding. Easy to slip them on and off, but they fit snug.