and a loop that goes under the foot just in front of the shoe heel. ...but that loop under the foot is the weakest part of the system
Slip a bit of thin walled plastic tubing over it.
Or that expanding finger-trap nylon mesh stuff you get as packaging around shafts.
Thanks a lot, that is a great tips that I'll try out
I've never tried any of those metal or rubber straps under the foot, but I can tell you the ordinary bungee chord on my gaiters is NOT really abrasion resistant... I think the only reason they manufacture it this way is a) because it's dirt cheap, and b) the bungee chord is so easy and cheap to replace.
Even in snow it will wear out because of the abrasion of the shoe. (My skiing boots are pretty solid, with rough edges).