A knife sheath has one job: hold the knife exactly where you left it, and let go only when you pull. Everything else, the material, the clip, the carry position, is in service of that. This guide covers what kydex does differently, the sheath we make for the knife most likely to need one, and the three ways to wear it.
What a kydex knife sheath actually is
Kydex is a thermoplastic sheet that softens with heat, takes the exact shape of whatever it is pressed over, and keeps that shape permanently once it cools. Pressed over a knife, it becomes a shell that grips the blade and handle by shape rather than by friction or a strap, which is why a kydex sheath clicks and a leather one does not. It is waterproof, it does not stretch out over a season of sweat, and it can be set to the exact retention you want. The trade is that it is rigid and it is specific: a kydex sheath fits the knife it was molded over and nothing else. Our guide to kydex covers the material in more detail.
The knife sheaths we make
Kydex Sheath for the Buck 110 and 112
The Buck 110 is the folding knife most likely to be carried in a sheath, because the classic version has no pocket clip and was designed around a belt pouch from the start. Our sheath replaces that pouch with molded kydex: the knife clicks in, retention is set with screws, and the whole thing is handmade in the USA by military veterans and guaranteed for life. It fits the 110 and the 112 Ranger, which share the shape the sheath grips. $29.99.
ROGAN Field Knife (RFK-PRO)
If you want a fixed blade that arrives ready to carry, the RFK-PRO ships with its own sheath and belt clip. It is stainless, which is the point: it was built compact and corrosion resistant for fishing, diving and wet work, where a carbon blade needs constant attention. $129.99.
For multitools rather than knives, the multitool sheath range is a separate line with a mold for most Leatherman and Gerber tools.
Why carry a folding knife in a sheath at all
Three reasons people move a folder out of the pocket. The knife is too heavy to hang off a pocket seam all day, which is the usual story with a 110. The pocket is already full, and a sheath moves the knife to the belt where it is not competing with a phone and keys. Or the knife has no clip, either because it never had one or because the clip was removed to stop it chewing through pockets. A sheath solves all three, and it makes the knife faster to reach with either hand.
Three ways to wear it
Vertical on the belt
The default. The sheath hangs beside the belt loop at 3 or 4 o'clock and the knife draws straight up. Simple, fast, and the most likely to dig into a car seat.
Horizontal
Turn the clip ninety degrees and the sheath lies along the belt instead of across it. The knife disappears under an untucked shirt and stops catching on seats, which is why people who sit all day end up here. Our horizontal carry guide covers the hardware.
Scout carry
For fixed blades, horizontally across the small of the back or just behind the hip, edge up. It is the most comfortable way to wear a fixed blade for a full day and the least obvious. See scout carry explained.
Setting retention so it holds and still draws
Retention on a kydex sheath is set with the screws, and the right amount is the least that still holds the knife. Tighten until the knife clicks in, then turn the sheath upside down and shake it: if the knife stays, you are done, and anything tighter only makes the draw slower. Check it again after a week, because kydex settles slightly around a new knife. If the knife ever comes out when you shake it, the fix is a quarter turn, not a new sheath.
Kydex, leather or nylon
Leather looks better and ages well, and it is the right pick if that matters more to you than performance. It also stretches, holds water and wears loose, so retention drifts over years. Nylon is cheap and holds anything, which is the problem: a pouch that fits every knife grips none of them, and the knife rattles. Kydex is the one that holds a specific knife at a specific tension for the life of the sheath, and it does not care about rain. For a working knife, that is the ranking.
Frequently asked questions
Does the Buck 110 sheath fit the Buck 112?
Yes. The 112 Ranger is a smaller version of the same design and shares the profile the sheath grips, so one mold covers both.
Will kydex scratch my blade?
Clean kydex is softer than a hardened blade and does not scratch it. What scratches is grit trapped inside the sheath, which turns the shell into sandpaper. Rinse the sheath out when it has been in sand or dust and the problem does not start.
How do I clean a kydex sheath?
Warm water, and dry it before the knife goes back in. There is nothing to condition and nothing to oil, which is most of the appeal.
Can I carry a folding knife horizontally?
Yes, and it is the fix for a sheath that digs when you sit. Mount the clip sideways so the sheath lies along the belt.
Is a sheath better than a pocket clip?
For a heavy folder like a 110, yes. For a light modern folder with a deep-carry clip, the pocket is usually easier. The sheath wins when the knife is heavy, the pocket is full, or the knife has no clip.
The bottom line
If you carry a Buck 110 or 112, the kydex sheath is the upgrade that makes you actually carry it. Set the retention light, and mount it horizontally if you sit for a living.
Related reading
The best kydex sheaths for everyday carry
How to make a kydex sheath
Best EDC fixed blade knives
Multitool sheaths with a belt clip
Kydex holsters by gun model
