The optional Sweat Guard protects your grip from you and you from your grip. The Combat Grip is where we trim away some of the leather from the holster backer. This allows a firmer grasp on the gun during the draw stroke. This modification does sacrifice a little bit of comfort but does increase the draw speed. This is an extra cost option because this cut is made to follow the contour of the slide/grip of the individual firearm and varies from one gun to another. Approximately 20% of our customers like this option, the others either have no preference or feel it sacrifices too much comfort. If you are unsure, don't order it, we can do it later if you would like, but once it's done, it's done.