I am not a fan of synthetic, kydex, etc., sheaths or holsters. I don't like the stiffness, the wear and scratches, etc. Knives and firearms get wear and scratches from use. I would rather that they don't get damaged from being put away. It isn't like there is a shortage of cows, sheep, and pigs. I see some great looking knives in the makers section. And then see a kydex sheath and think nope cheapness. And no I am not going to have someone make a leather sheath for me. I do not buy something new only to fix it. I am not talking about customizing a knife. Just anti cheapness. Am I the only one that feels this way?
Although I like a good quality leather pouch/holster, I generally prefer plastic... I think many popular holsters are plastic (not Kydex) that people generically call Kydex... I'll even grab nylon sheaths for my folding knives/MT's or incidentals belt pouch. Generally speaking, for my activities, I often have to work in sludgy, humid, sweaty, rainy, and snowy conditions. If the leather is next to my skin, it will soak up the sweat. If I am getting soaked in the rain, snow, or getting sludged on (like mud, gutter residue, salty snow from a snow blower) and the leather is exposed, it will soak up the water and sludge. This can also affect the shape, tensile strength, etc. of the leather, as well as expose the metals of whatever you are carrying underneath.
A properly (and continually) maintained leather anything should resist much of this, but that is a time cost that is absent on plastic/kydex. For example, I will not wear leather protective gear if I know I'm riding through multiple rain storms, for example... also note, that some lower cost leather jackets/pants have a weakness at the seams from the thread and stitching used.
Additionally, some leather wear on whatever you put in it is inevitable, especially if the metal is coated with a color, i.e. black.
Generally speaking, I will wear plastic/Kydex or nylon if the sheath/pouch/holster will be exposed to the elements. Additionally, if I am going to be sweating a lot, if it's next to my skin I will go for plastic, even if it is less comfortable than a quality leather piece.
The biggest issue I have with many plastic sheaths for fixed blades, is that some of them will slightly dull the blade.
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