I got one of the Old Mac pads to go under my Bob Marshal Endurance.
It's okay. I'm not thrilled with it. The side against the horse is a
little slippery. It does have wonderful ventilation and paired with one of
the "no sweat" pads like the Dixie Midnight, the ventilation is great. I
guess I'd give it a C+, if the price is good, go for it, other wise, for the
money, I'd look else where. My favorite is the Skito pads.