So, some time back I had bought a PSA Dagger, I bought a kydex holster that was recommended for it. The holster was nice & had good retention. I left the holster in the truck on a hot day. I later realized that the holster no longer had good retention. I heated it with a hair dryer & tightened it up. I did not realize that this could happen. I just thought I'd put it out there as I had no idea. I have used plastic/nylon or carbon fiber holsters in the past with no issue. It just never occurred to me.