I currently have a pair of Flak Jacket XLJ for prescription that I use for driving, but Im looking for a pair for everyday use. I've been looking at the Big Taco and the Offshoot and someone also mentioned Batwolf. The Flak Jacket is a little small (not too bad), but I want to go larger. What is the main difference between the Offshoot and the big taco and is the batwolf that much smaller? Thanks