Unfortunately sweat is a definite enemy of leather products. Basically the only thing that you can do to slow down it's effect on your leather holster is when you return home to get a damp cloth with straight water on it and wipe the holster down good to slow down the effect of the salt that is produced by sweating. Do not saturate the leather just wipe it with the well moistened cloth. Let it air dry. There is no good answer that I know of just one of those things you can slow down the effects.