Types of felting

15:00 Aistė 7 Comments

There are two main types of felting used today -- wet felting and needle felting. At Woolenclogs we mostly use wet felting and sometimes I decorate some of our clogs by needle felting. Here's how these processes work and what they are. (There's another old felting method described at the bottom as a bonus)

Wet felting

Wet felting is one of several methods which can produce felt from wool and other animal fibres. Warm soapy water is applied to layers of animal hairs. Repeated agitation and compression causes the fibres to hook together into a single piece of fabric. Wrapping the properly arranged fibre in a sturdy, textured material, such as a bamboo mat or bubble wrap, will speed up the felting process. After the wet felting process is complete, the felted material may be finished by fulling.

Wet felted wool clogs by Woolenclogs

Only certain types of fibre can be wet felted successfully. Most types of fleece, such as those taken from the alpaca or the Merino sheep, can be put through the wet felting process. One may also use mohair (goat), angora (rabbit), or even certain dog hair. These types of fibre are covered in tiny scales, similar to the scales found on a strand of human hair. Wetting and soaping the fiber causes the scales to open, while agitating them causes them to latch onto each other, creating felt. Plant fibres and synthetic fibres will not wet felt.
A subset of wet felting is nuno felting. It is a technique developed by Polly Stirling - a fibre artist from Australia. The technique bonds loose fibres, usually wool, into a sheer fabric such as silk gauze, creating a lightweight felt.

Needle Felting

Needle felting is a popular fibre arts craft that creates felt without the use of water. Special needles that are used in industrial felting machines are used by the artist as a sculpting tool. While erroneously referred to as "barbed" needles, they in fact have notches along the shaft of the needle that grab the top layer of fibres and tangle them with the inner layers of fibres as the needle enters the wool. Since these notches face down towards the tip of the needle, they do not pull the fibres out as the needle exits the wool, unless a reverse needle is used (with this desired effect). 

Needle felted teddy nose (courtesy of SoftlyBearPaw)

Once tangled and compressed using the needle, the felt can be strong and used for creating jewellery or sculpture. Finer details can be achieved with this method using a hand-held tool with either a single needle or a small group of needles (2-7), so it is a popular technique for producing 2D and 3D felted work.
Certain artificial as well as natural fibers can be needle felted. Most of the machine needle felt is synthetic.


From the mid-17th to the mid-20th centuries, a process called "carroting" was used in the manufacture of good quality felt for making men's hats. Beaver, rabbit or hare skins were treated with a dilute solution of the mercury compound mercuric nitrate. The skins were dried in an oven where the thin fur at the sides turned orange, the colour of carrots. 

Image taken from http://catspahamas1.chainreactionweb.com/catalog
Pelts were stretched over a bar in a cutting machine, and the skin was sliced off in thin shreds, with the fleece coming away entirely. The fur was blown onto a cone-shaped colander and then treated with hot water to consolidate it. The cone then peeled off and passed through wet rollers to cause the fur to felt. These 'hoods' were then dyed and blocked to make hats. The toxic solutions in the dye and the vapours it produced resulted in widespread cases of mercury poisoning among hatters, which may have been the origin behind the phrase "mad as a hatter".

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  1. I love felt!
    That history about those hats is intriguing!

  2. Great post, I confess I knew very little about felting but have found it all very interesting, specially the hat making process and the mad hatters!

    1. This was a surprise to me as well -- heard the phrase often enoughm, but never knew the origins!

  3. I like needle felting the best, because it's close to sculpting.

    1. I love that too, only I'm not patient enough I guess :) it takes a long time to make even a tiny thing when needlefelting.

  4. I have heard about the wet felting before, but knew very little about the other two. Thanks for sharing!

  5. I’d like to thank you for writing on this topic. The process of blending of different fibers into a single fabric is made to improve quality of this. Fibres Used in Concrete