Originally Posted by
jonwvara
Proofide seems like a pain in the butt to me. I mean, c'mon, treat the underside of the saddle? I rub a little Lexol into the tops of all my saddles once a year or so and call it good, because it is good.
Originally Posted by
unworthy1
If you ride without fenders, in the rain, it's the underside that gets soaked.
and the "raw" leather on the bottom (they'd call it the flesh side) is more absorbent than the finished top.
Like everything to do with all-leather saddles, this is yet another point of controversy and debate. Do as Brooks says, or don't. YRMV.

Yup
FWIW I treat the underside of mine when I get them and maybe once every 3-5 years if I think about it. Tops get treated annually. I ride with fenders.
I have one old Wright's saddle that is around 35 years old that I have been riding pretty regularly since 1978.
Aaron