dual coat

Many of the Swedish heritage breeds have dual coats, just like Icelandic sheep, Navajo Churro, Karakul, North Ronaldsay and some Shetland sheep. A dual coat has a combination of long and strong outercoat fibers and soft and airy undercoat fibers in the same staple. Today I dive into dual coats and reflect over how I work with these versatile fleeces.

Dual coats are common in primitive breeds, but not with all sheep of that breed and not necessarily consistently over the whole body of the sheep. Swedish heritage breeds like dalapäls, Värmland, Gestrike (featured image above), Klövsjö and Åsen sheep along with rya, gute and Åland sheep are all breeds that can have dual coats on parts or the whole of their fleeces.

Check out the linked breed study posts above to dive deeper into different ways I work with dual coats.

What is a dual coat?

Dual coats consist of long hairs, the outercoat (täckhår) and shorter wool, the undercoat (bottenull). These fiber types look very different and have different purposes. The long outercoat fibers are strong, often shiny and usually packed quite densely in the tips while the shorter undercoat fibers are soft, fine and airily distributed.

The purpose of the coats

The purpose of the outercoat on the sheep is to keep the sheep dry. When rain hits the fleece, the long and dense outercoat tails lead the rain drops away from the body of the sheep. The purpose of the undercoat is to keep the sheep warm. With its lofty distribution air comes in between the fibers and keeps the sheep warm.

In this Icelandic fleece it is easy to imagine the rain drops sliding on the dense outercoat tips out and away from the body of the sheep.


In addition to undercoat and outercoat some fleeces have kemp. Kemp is a coarse hair fiber with a medulla, a core with air-filled cells, that takes up at least 60 per cent of the diameter of the fiber. Due to this wide medulla core the kemp fibers are brittle and short (because they break from being so brittle). They are usually white or black and don’t take dye. Kemp fibers are coarse, quirky and stick out of the yarn and usually fall out sooner or later. This is very evident when you prepare a fleece with kemp in it – the floor will be full of kemp that has fallen out of the fleece. Also when you full a garment knit with a yarn with kemp you will find lots of kemp fibers that have crept out of the textile in the agitation.

Fine undercoat fibers, coarser outercoat fibers and quirky kemp fibers in Gestrike wool.
Fine undercoat fibers, coarser outercoat fibers and quirky kemp fibers in Gestrike wool.

In a loupe image it’s possible to see the difference in diameter between undercoat, outercoat and kemp fibers.


The wool types on the sheep cooperate, all in an effort to keep the sheep dry and warm. The outercoat armours the undercoat so that the undercoat can stay airy and the outercoat can stay upright. The undercoat in turn form a fundament for the outercoat. Kemp fibers also help keeping the staple upright and airy so that the rain doesn’t get the sheep wet and cold.

Gunvor the Gestrike ewe who was my longitudinal fleece study sheep
The staples on Gunvor the Gestrike sheep stand out from her body, keeping rain and cold away.

Let the wool lead the way

When I spin a fleece, any fleece, I like to use the properties of the wool to make a garment that is for me what the fleece was to the sheep that once grew the wool. I let the characteristics of the wool lead the way as I prepare, spin and use it. With a dual coat there are so many ways I can do this and create a wide range of yarns from one single fleece.

Depending on the wool I have and what I have in mind for it I can choose to

  • Separate undercoat from outercoat and prepare the coats separately.
  • Semi-separate the coats. By this I mean that I remove some of one of the coats but not all. Or separate the coats and reintroduce a part of one of the coats to the other.
  • Prepare the coats together.
  • Spin from the lock.

Separating coats

There are different ways to separate the outercoat from the undercoat of a dual coat, depending on what tools you have available.

By hand

The easiest way is to use your hands and separate staple by staple. I hold the staple between my hands with the tip end in one hand and the cut end in the other. I pull gently and wiggle slightly until I feel the coats gliding in different directions. When I have separated the coats I can continue to prepare them separately.

With cards

If you have cards but no combs you can separate the coats with the cards. Place a staple with the cut end on the long edge of the card and push it lightly into the teeth with one hand. With the other hand, pull gently in the tip end until the coats separate. From here you can continue to prepare the coats separately.

With combs

My go-to way to separate coats is with combs. With the combs you can

  • tease both coats
  • separate the coats from each other
  • create a top from the outercoat fibers.

Usually I use my combing station but sometimes also with my mini combs. If possible, I use two-pitched combs. Two or more rows of teeth will hold on to the shorter fibers better than single pitched combs, keeping the undercoat in the combs as I doff off the outercoat.

To separate the coats with combs I then

  • find the cut ends of the staples
  • charge the comb by sliding the cut ends onto the teeth
  • keep as little of the staples as possible on the handle side of the comb
  • charge the comb with up to a third of the height of the tines
  • keep the combs perpendicular to each other and comb with the horizontal comb in a horizontal circular movement
  • change the orientation of the movement to a vertical circle when the first comb is empty
  • Work back and forth until the wool is fully separated.

The wool is now combed and the fibers evenly separated. All cut ends are in one end and the tip ends in the other. I like to stop at an odd number of passes. This way I pull the outercoat from the cut ends, which will generate a smoother drafting of the fibers.

The undercoat fibers stop before the outercoat fibers do. I grab the outercoat fibers outside of the place where the undercoat ends. I pull and wiggle lightly, carefully listening to the wool. When the fibers slide easier past each other I stop and make a new grip, closer to the undercoat fibers but without including them. To create a continuous top I keep pulling out the outercoat, changing my grip until I can’t get more outercoat fibers out of the comb. I even the top out by pre-drafting it lightly and wind it into a bird’s nest. When I pull the last part of the top from the comb I can either comb it together with a couple of more tops or start spinning straight away.

I pull the undercoat out of the comb perpendicular to the teeth. This way any nepps, vegetable matter and too short fibers stay in the combs and I can use this waste for mulching in the garden. The teased undercoat is now ready for further preparation.

You can read more about my favourite combs here.

Carding the undercoat

While the outercoat has been combed during the separation of the coats I have lovely little teased combfuls of undercoat that I usually card. You can read more about carding in this blog post.

I would typically spin the carded undercoat woolen for a soft and warm yarn and the outercoat worsted for a strong and shiny yarn to enhance their respective superpowers.

Semi-separating coats

One lovely thing about dual coats is the endless opportunities I have to customize the fiber type content and the yarn that I spin. Above I describe a complete or close to complete separation of the outercoat from the undercoat. But I can also choose to doff off only part of the outercoat to create a yarn that is soft from the undercoat but still has some strength and shine from the outercoat. I could also make a complete separation between the coats and then reintroduce some of one coat to the other. For example, I can make two sock yarns from one fleece. I the main sock yarn I may use both of the fiber types together, but add more of the outercoat for the heel and toe yarn.

Combing coats together

Combing the coats together will result in a yarn that is still strong but has some softness too. A yarn like this could be a good allround and durable yarn.

For keeping fiber types together I prefer single pitched combs. With only one row of teeth both undercoat and outercoat slide swiftly through the teeth for a nicely blended top. Up until I doff the wool off the comb I take the same steps as described above. When the fibers are separated I grab the wool a bit closer to the teeth to avoid getting only the outercoat. I pull and wiggle gently to make a long top from both undercoat and outercoat.

One challenge with combing the coats together is having one end of the top with mostly outercoat fibers and the other with mostly undercoat. To reduce this risk I can recomb the top. I put the combed wool back onto the comb in sections and recomb it for a couple of passes and then doff or diz it off again. You can read more about this process in my post Combing different fiber lengths.

Carding coats together

Just as I can comb both coats together I can card them together. This will create an airy allround yarn that still has some strength.

I always start by teasing the wool. This is to open up the fibers before carding to prevent strain in the fibers and in my body. You can read more about teasing here.

The different lengths in a dual coat marry well together in a carded rolag. Rya wool left and middle. The staple on the right is mohair that I added in this case for extra sock yarn strength.

But is it possible to card fibers in this length? When I card fibers that are perhaps 20 centimeters I always make sure they are accompanied by shorter fibers. In a combination of short, medium and long fibers the fibers sort of marry each other and create an airy rolag. A dual coat therefore usually works well to card since there are different lengths in the staples. The longest fibers will double around the rolag, but I don’t see that as a problem since there are so many other lengths that won’t.

Spinning from the lock

When I want to work with a very light preparation and as few tools as possible or to preserve a colour variegation I spin from the cut ends of lightly teased locks. I tease with my hands, cards, flicker or combs and spin. Drafting can be a bit of a challenge since the fibers are more densely packed than in a full separation. But the result is usually a beautifully raw yarn with lots of integrity. You can see an example of this and a method I played with in this post about Icelandic wool.


Many dual coats have different colours in the outercoat and undercoat. This presents a wonderful opportunity to play with the colours. If you for example separate the coats and spin a strong outercoat yarn and a soft undercoat yarn you can combine these in a weaving project. If you weave twill you would end up with one side with the strength of the outercoat warp in one colour and the other side with the softness of the undercoat in another. Just like the wool on the sheep, a soft undercoat layer to keep the body warm and a strong outercoat layer to keep the wet out. Allowing the coats to cooperate still after a long process from fleece to textile just warms my wooly heart endlessly.

A baby sample for a twill weave with separated undercoat and outercoat of the Gestrike sheep Elin.

A wide spinning spectrum

As you see, a dual coat is usually a very versatile fleece that you can prepare in a number of ways depending on the characteristics of the fleece and what projects you have in mind. With this wide spectrum of preparation techniques it is easy to see an equally wide spectrum of spinning opportunities. Add to that the additional possibilities to play with the natural colours of the fleece and different fiber qualities of lamb’s fleeces and adult fleeces. From the finest next to skin woolen lamb’s undercoat yarn to coarse and strong rug yarn. From baby clothes through shawls, mittens, socks, hats and sweaters to woven textiles for clothing, upholstery, tapestries and rugs. For a hand spinner a single dual coat is a treasure box with endless opportunities to make a wide variety of yarn and textile and honour the sheep that once grew the wool.

Read the Spring 2021 Double coated issue of PLY magazine. I’d packed with in-depth articles about dual coats.

I just love writing a blog post where I already have all the necessary photos from previous posts.

Happy spinning!

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8 Replies to “dual coat”

  1. What a great post! I am back working on “set aside” Icelandic fleece prep, and discovered the semi-separated method you describe in this post. It is destined to become a proper 3-ply yarn. Soft but with some strength. You beautifully sum up (and clear up) mystery methods on dual coats in one post. It gets confusing reading one article, then another, and yet another… all suggesting that is the only method. You have taken the mystery out of it. Tusen takk!

  2. Very informative post! I’m having trouble visualizing this step though: “I pull the undercoat out of the comb perpendicular to the teeth.” Do you have another post that shows that step? I’ve had combs for a couple of years but haven’t used them yet but now I’m inspired to do so!

    1. I’m glad you enjoyed it! The passage you are struggling wirh means that with the teeth vertical you pull the wool horizontally. That way the stuff you don’t want, like short fibers, nepps and vegetable matter stays in the comb and the wool you pull out is nice and orderly and good. I hope this makes sense to you.

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