I don't know what type of leather Pop's uses - the earlier models seemed to be made of recycled Etruscan goat scrotums or similar and were nothing like as tough as the genuine Aviation Leathercraft articles. But they were considerably lighter in weight.
The only criticism I would have of the Aviation Leathercraft version is that it is rather long in the back - rather like those awful old 1970-ish No.2HD Thunderbirds jackets....
