Brooks Proofide Jar - 30ml SinglesBrooks Proofide Jar 30ml Singles. Proofide keeps the leather supple as it is specially formulated from natural ingredients to condition preserve and water proof saddles. Proofide is the only substance that should be used to care for your Brooks Leather Saddle A new saddle should be treated with Brooks Proofide leather dressing to help assist the breaking in" process periodically during the first 3 6 months