Cimorene

They're a bit expensive but they're worth it, if they work for your foot. You should go somewhere and try them on though, because I've had someone comment that they're uncomfortable for them due to the shape of their foot and that makes them not fit right in the heel. All the boot ones have the same shape, so.

But anyway, yes, wonderful traction, flexibility, winter insulation, comfort and fit. They've superceded Birkenstocks as most-comfortable-to-stand-and-walk-in-all-day-I've-ever worn. (Unfortunately they cost about the same, haha. You really have to pay for good sole technology!)