Personally I don't line my holsters unless asked. Seems lining good leather with more leather doesn't help much at all except for pleasing the buyer. I've toted guns for decades in the woods both lined and unlined and haven't seen a lot of difference in wear on the firearms. From my years of rigorous testing ,lol, I've found that there are three things that keep a firearm from wearing prematurely and getting dirty in the holster. A toe in the holster so you dont sit down and fill the barrel with dirt, a tight holster so it doesn't shift around and wear itself self as you walk and lastly and most importantly personal responsibility for the care of my firearm and holster. If I do line a holster its like Dwight does but i may use a different lighter piece for the inside.