There's a IV-XL on barnstormers that I've been eyeballing. But I haven't been able to find any real info on what the differences are between the Classic and XL. A 503 on the front is all? Or is there major structural differences, lite weight fabric, etc? This isn't something I cared to bother John and Debra about, I'm sure they're busy enough, but I'd like to know a little more before going any further in the decision making proccess.

Dave