Who invented this stuff and who decided it was good for knife sheaths? Almost all my kydex sheaths end up scratching my blades! I notice some oil them up. Is that a given? What's the deal with this plastic crap? I suppose I never noticed before for I got kydex with all my RCK (really cheap knives) and I never really cared if they showed wear or not. Now I get them with some handmade blades and WTF? they come to me all scratched up. I toss these sheaths and put em in a shoe box. Rant over. I don't really want to know who invented it.