How a Leather Knife Sheath Works

The parts of a leather knife sheath (body, welt, throat, belt loop) and how each one helps hold the knife and protect the stitching.

Updated 2 November 2026

A sheath does three jobs. It covers the edge. It holds the knife where you put it. It keeps the knife safe from knocks. Each part described below handles at least one of those jobs.

What a sheath is for

Covers the blade. A sheath stops the knife from cutting or stabbing you or another object when it's not in use.¹
Protects the edge. It also guards the edge from damage and cushions the knife if you drop it.¹
Gives you somewhere to carry it. That's the belt loop's job, covered below.

The parts

Body

The body is the two leather sides that wrap the knife. Most of the sheath's shape comes from here. It's the biggest part, and it's the part you'll spend the most time wetting, pressing and waiting on.

Wet leather can be stretched and molded to fit different objects.²
Dry the sheath around the knife and the leather ends up shaped to it.¹
One maker's example uses a 4-to-5-ounce piece for the main body.³
An ounce here is a thickness, not a weight. The leather page explains it: Choosing Leather for a Knife Sheath.

Welt

The welt is a strip of leather sewn between the two sides. It makes a buffer between the knife's edge and the stitching.¹

Without it, the sharp edge sits right against the thread.
On the pattern, space is added around the edge side of the knife for it.⁴
The handle is thicker than the blade, so a flat strip of welt may not suit the whole length.⁴

The full method is in Making and Fitting a Welt.

Throat

The throat is the top end of the sheath, where the knife goes in. Weaver lines it up with the top of the knife when forming the leather.³

One maker says the tip and throat need a touch more durability than the main body.³
The upper corner is the part that takes the most abuse and is most vulnerable to wear, so one maker adds a backstitch there.¹

Seam

The seam is the line of stitches that joins the layers.

The stitch holes go through all three layers: front, welt and back.¹
A groove cut along the seam lets the thread sit low, out of the way.²
Stitching has its own page: Stitching a Knife Sheath.

Belt loop

The belt loop is a strap, usually an extension of the back piece, folded down and stitched.

Size the loop so your belt fits through it, with at least 2 inches of width.¹
Fasten it just below the top of the sheath. Any deeper and the handle may not seat well.²

How it holds the knife

In a plain stitched sheath, the leather itself does the holding.

From the leather body to the knife on your belt.

The sheath dries around the knife, so the shape matches.¹
The fit should be a bit snug at first. It loosens a little over time.²
The welt keeps the edge off the thread, and the body surrounds the rest of the knife.¹

Where the pattern comes in

Every sheath starts as a paper shape traced from the knife, and that shape stands for the inside of the finished sheath.⁴ Get it wrong and every later stage has to cope with the mistake, so it's worth slowing down there.

The next page to read is the pattern page. After that, work down the list in order.