Originally Posted by gunslinger
My choice is alpaca, second is Mohair.
Neither of these stretch....
You don't want the girth to stretch? Do you mean long term because it wears the girth faster or short term because you don't want the saddle to loosen (or maybe even both)?
Personally, I won't use a girth that doesn't have elastic on at least one end, but preferably both. While I ride with a fairly loose girth, I like the stretch as I feel it makes the horse more comfortable to have something that at least sort of moves with them as they go down the trail.