I like kydex for it's durability simplicity and ability to make an adjustable friction retention but I don't like how it can wear on a blade. I wan't to make a hybrid sheath with leather lined kydex... From the homework I've done it sounds like nobody does this or thinks it's a good idea. Pretty much everything I've read people say the problem is the leather will detach and bunch up inside the kydex... Ok hmmmm well this doesn'treally make sense to me. A normal leather sheath doesn't have issues like that... It seems to me putting a layer of any hard material over a leather sheath shouldn't have much effect. I mean you would have to be seriously rough with it...But idk lol Anyway... It seems to me even more... If one were to sandwich a layer of leather between two seperate pieces of kydex and make it adjustable and replace/repairable anyway there should be no issues at all. Plus you can put an adjustable friction lock on it and take it apart to clean it inside. Is nobody doing this?... Seems like the best of both worlds to me.