Wet Felting

Part of Textiles and Weaving

Wet felting creates dense, durable fabric directly from loose wool fibers without any spinning or weaving — making it the simplest method of turning raw animal fiber into functional textile.

Felt may be humanity’s oldest textile technology, predating both spinning and weaving by thousands of years. Unlike woven fabric, felt requires no loom, no spun thread, no specialized equipment — just wool, hot water, soap, and physical effort. A person with no textile experience can produce serviceable felt on their first attempt, making it the ideal starting point for a community rebuilding its textile capability.

The principle is simple. Wool fibers have microscopic scales on their surface, like shingles on a roof. When exposed to heat, moisture, and agitation, these scales open and interlock with neighboring fibers, creating a permanent mechanical bond. Once felted, the fabric cannot be unfelted — the process is irreversible. This interlocking produces a dense, wind-resistant, water-resistant material that can be cut without fraying, shaped into three-dimensional forms, and made in any thickness from 2 mm to 30 mm or more.

Understanding Wool for Felting

Not all wool felts equally well. The key factors are fiber diameter, scale structure, and crimp.

Wool Type	Fiber Diameter	Felting Speed	Felt Quality	Best Use
Fine merino-type	15-22 microns	Very fast	Dense, smooth	Hats, clothing, fine items
Medium crossbred	22-30 microns	Fast	Good density, moderate texture	General purpose, blankets
Coarse breeds (e.g., Scottish Blackface)	30-40 microns	Moderate	Sturdy, rough texture	Rugs, yurt walls, insulation
Hair-type (e.g., Wiltshire Horn)	Variable	Poor to none	Does not felt well	Not recommended for felting
Alpaca	20-30 microns	Slow	Dense if blended with sheep wool	Blend 30-50% with wool

Fiber Selection

The single most important factor in felting success is using the right wool. Fine to medium wool from sheep breeds developed for wool production felts best. Coarse or hair-type fibers felt poorly or not at all. If unsure about a fleece, test-felt a small sample (palm-sized) before committing to a large project. If it does not begin to hold together after 10 minutes of vigorous agitation, the wool is unsuitable.

Fiber Preparation

Washing the Fleece

Raw wool contains lanolin (natural grease), dirt, and vegetable matter. While some lanolin aids felting (it provides lubrication during the initial stages), excessive grease or dirt prevents fibers from interlocking.

Wash raw fleece in hot water (not boiling — 60 C maximum) with soap or plant-based detergent. Do not agitate excessively during washing or the wool will begin to felt in the wash water. Soak, gently squeeze, lift out, and repeat in clean water until the water runs reasonably clear. Dry the washed wool spread flat on a screen or rack.

Carding

Carding aligns and opens the fibers, creating a uniform batt (sheet of prepared fiber) for felting. Use hand carders (two paddles with fine wire teeth) or improvised tools (teasel heads, thistle brushes).

Carding procedure:

1. Place a small amount of washed, dried wool on one carder
2. Draw the second carder across the first, teeth facing the same direction
3. Transfer the fiber back and forth between carders 5-8 times
4. The result is a thin, even sheet of aligned fibers called a rolag or batt
5. Stack these sheets to build up the desired thickness

Skip Carding for Speed

If hand carders are unavailable, you can felt with hand-pulled (teased) wool. Pull the washed fleece apart by hand into thin, even wisps. The felt quality will be less uniform, but it works. This is the fastest path from raw sheep to functional felt — wash, pull apart by hand, layer, felt.

The Felting Process

Step 1: Layering

Lay out a work surface — a bamboo mat, straw mat, or sheet of burlap works well. The mat will be used for rolling later.

Build up your fiber in thin, even layers:

1. First layer: Lay fiber wisps in parallel lines, all running the same direction (for example, north-south). Cover the entire project area with an even layer — no thick spots or thin spots. The layer should be thin enough to be slightly translucent.

2. Second layer: Lay fiber perpendicular to the first layer (east-west). Same thickness and evenness.

3. Third layer: Same direction as the first (north-south).

4. Fourth layer (optional but recommended): Same direction as the second (east-west).

Alternating the fiber direction in each layer creates a fabric with equal strength in all directions. Laying all fibers in one direction creates fabric that is strong along the fibers but weak across them and will tear easily.

Minimum Layers

Three layers is the absolute minimum for functional felt. Four layers produce a more durable fabric. For items that must resist wind, rain, or abrasion (boots, yurt walls, horse blankets), use 5-6 layers. Each additional layer adds approximately 2-3 mm to the finished felt thickness (after shrinkage).

Step 2: Wetting

Prepare a solution of hot water and soap. Water temperature should be 50-65 C — as hot as your hands can tolerate. Soap reduces surface tension, helping water penetrate the fiber, and it lubricates the scales during interlocking.

Soap options:

• Animal fat soap (tallow + wood ash lye) — the traditional choice
• Plant-based soap from soapwort or yucca root
• Plain wood ash lye water (weak solution)
• In emergencies, hot water alone works but takes much longer

Sprinkle the hot soapy water over the fiber layers. Do not pour — pouring displaces the carefully arranged fibers. Use your hands or a brush to gently pat the water into the fiber until the entire piece is saturated. The fiber should be thoroughly wet but not swimming in excess water.

Step 3: Initial Felting (Gentle Phase)

This phase begins the interlocking process. Work gently — aggressive handling at this stage will displace fibers and create thin spots or holes.

1. Place a sheet of thin fabric (muslin, netting, or open-weave cloth) over the wet fiber to hold it in place
2. Press gently with flat hands, working from the center outward
3. Use small, circular motions with light pressure
4. Work the entire surface evenly for 10-15 minutes
5. Periodically lift the covering cloth and check that fibers are not sticking to it
6. Add more hot soapy water if the surface dries out

The pinch test: After 10-15 minutes of gentle work, pinch a small section of the surface between thumb and forefinger and lift gently. If the entire layer lifts as a unit without individual fibers pulling free, the initial felting is successful and you can proceed to vigorous agitation. If individual fibers pull away, continue gentle work for another 5-10 minutes.

Step 4: Full Felting (Vigorous Phase)

Once the piece holds together as a unit, increase the agitation:

Rolling method (most common for flat felt):

1. Roll the wet felt tightly around a dowel, stick, or the bamboo mat
2. Roll the bundle back and forth on the work surface 50-100 times with firm pressure
3. Unroll, rotate the felt 90 degrees, re-roll, and repeat
4. Continue rotating and rolling until the felt has shrunk evenly in all directions

Hand rubbing method (for small pieces):

1. Rub the surface vigorously with flat hands or the backs of your knuckles
2. Fold the piece, rub some more, unfold, and continue
3. Pick up the piece and throw it down onto the work surface repeatedly

Foot method (for large pieces like blankets or yurt walls):

1. Lay the wet felt on a clean floor or large mat
2. Walk, stamp, or dance on it
3. Roll and reposition regularly for even treatment

Check Shrinkage

Felt shrinks 20-40% from its laid-out size during fulling. A piece that starts 100 cm x 100 cm will finish around 60-80 cm square. Plan your initial layout accordingly — make it 30-50% larger than your desired finished size. The exact shrinkage depends on wool type, number of layers, and how vigorously you full.

Step 5: Fulling

Fulling is the final densification phase. Continue agitation with progressively firmer pressure until the felt reaches your desired density. Test by trying to push a finger through the felt — properly fulled felt resists penetration. For water-resistant applications, continue fulling until the felt is so dense that water beads on the surface rather than soaking through.

Fulling stages:

Stage	Test	Density	Suitable For
Light fulling	Finger pushes through easily	Low	Inner layers, lightweight items
Medium fulling	Finger pushes through with moderate pressure	Medium	Blankets, clothing, bags
Hard fulling	Finger cannot penetrate	High	Boots, hats, yurt walls, rugs

Step 6: Rinsing and Drying

1. Rinse the finished felt thoroughly in clean cool water to remove all soap
2. Gently squeeze out excess water — do not wring (wringing creates permanent creases)
3. Roll in a dry towel to absorb moisture
4. Shape the piece to its final form while still damp
5. Dry flat on a rack in a well-ventilated area, out of direct sun
6. Felt may take 1-3 days to dry completely depending on thickness and climate

Thickness Control

Desired Finished Thickness	Number of Layers	Starting Batt Thickness	Typical Application
2-3 mm	3-4 layers	8-12 mm	Clothing, light bags
4-6 mm	5-6 layers	15-20 mm	Heavy clothing, blankets
8-12 mm	7-10 layers	25-35 mm	Boot soles, rugs
15-25 mm	12-20 layers	40-70 mm	Yurt walls, insulation panels

Practical Projects

Felt Hat

A felt hat demonstrates three-dimensional shaping. Lay fiber over a wooden hat form (block) or an improvised form (an upturned bowl wrapped in plastic). Felt directly on the form, shrinking the felt down tight around it during fulling. Cut the brim to shape after drying. A well-made felt hat is waterproof, windproof, and warm — one of the most useful single items in cold or wet climates.

Felt Boots (Valenki Style)

Traditional Russian valenki are made from a single piece of felt, fulled over a boot-shaped form. Start with a flat piece much larger than the finished boot. Fold it around the form and continue fulling until it shrinks tight. The seamless construction makes felt boots naturally waterproof at the seams (because there are no seams). Apply a layer of tar or wax to the sole for abrasion resistance.

Felt Blankets and Sleeping Mats

Lay fiber in a rectangle 30-50% larger than desired finished size. Use 5-7 layers for a blanket, more for an insulating sleeping mat. Large pieces are easiest to full by walking on them. A felt blanket of medium-coarse wool is warm, wind-resistant, and naturally fire-retardant (wool does not sustain flame).

Yurt Wall Felt

The single largest traditional felt product. Yurt (ger) walls require panels approximately 150 cm tall and 300-500 cm long, made from 15-25 mm thick felt. These are traditionally made by the entire community working together — laying out fiber on an enormous mat, wetting it, rolling it around a log, and dragging the log across the ground behind a horse or by a team of people pulling ropes. The massive agitation produced by dragging creates the dense, weather-resistant felt that keeps yurt interiors warm in Central Asian winters.

Wool Quantity

Felting consumes far more raw wool than spinning and weaving the same area of fabric. A 1 square meter blanket of medium thickness requires approximately 800-1,200 grams of prepared wool. A yurt wall panel may require 10-15 kg. Plan your sheep flock and shearing schedule accordingly — felt production consumes the bulk of a pastoral community’s wool output.

Cutting and Finishing

One of felt’s great advantages is that it does not fray when cut. You can cut any shape with scissors or a sharp knife without hemming or edge finishing. This makes felt ideal for:

• Patterned applique (cut shapes and sew them onto other fabrics)
• Gaskets and washers (mechanical seals)
• Insoles and padding
• Decorative cutwork

To join felt pieces, use a whip stitch or blanket stitch along the edges, or overlap pieces and stitch through both layers. For waterproof joins, overlap by at least 3 cm and full the join area with hot soapy water until the fibers of both pieces interlock across the join.

Summary

Wet felting creates fabric by interlocking wool fibers through heat, moisture, soap, and agitation — no spinning or weaving required. Use fine to medium wool, lay fibers in alternating perpendicular layers (minimum 3, ideally 4+), wet with hot soapy water, then work from gentle patting to vigorous rolling. Test progress with the pinch test (fibers should lift as a sheet, not individually). Expect 20-40% shrinkage — plan initial size accordingly. Felt does not fray when cut, making it ideal for hats, boots, blankets, and yurt walls. The process is simple enough for a beginner’s first project, but producing dense, weather-resistant felt for critical applications requires sustained physical effort and generous amounts of raw wool.