wet felt cat house

What is wet felting?
Wet felting is a process used to make wool and other animal fibers into the dense fabric known as felt, using just hot water and soap - one of the most sustainable processes in textile.
There is no spinning, knitting, crocheting or weaving involved.

The process uses heat, agitation, and moisture to shrink and bond the fibers of the wool together.
Wet felting process involves making layers of animal fleeces that have not yet been spun into yarn or thread. Natural wool fibre is stimulated by friction and lubricated by moisture (usually soapy water), and the fibres move at a 90 degree angle towards the friction source and then away again, in effect making little "tacking" stitches. Usually, as few as two and as many as six thin layers of fleece are used. Only 5% of the fibres are active at any one moment, but the process is continual, and so different 'sets' of fibres become activated and then deactivated in the continual process.
Only certain types of fiber can be felted successfully. Most types of animal fleece, such as those taken from the alpaca or the merino sheep, can be put through the wet felting process. This is because these types of fiber are covered in tiny scales, similar to the scales found on a strand of human hair. Wetting and soaping the fleece causes the scales to open, while agitating them causes them to latch onto each other, thus creating felt. Plant fibers and synthetic fibers will not felt, and neither will types of wool that are labeled as "super wash," as this type of woolen fiber has been chemically treated and lacks the outer coating of microscopic scales.
Often, wet felting is done by hand, using a screen to keep the layers of fleece together while soapy water is applied with a sponge. The process works best when the water used is hot and the soap used is a mild soap rather than a harsher detergent. Sponging the fibers creates slight agitation that encourages them to stick together. If too much water is used, the lightweight fibers will not stick together but will float away from each other instead.
After the wet felting process is complete, the felted project is finished by fulling, or agitating the fibers on a rough surface such as a washboard. This process removes any air bubbles that might have been trapped between the fibers while felting, and makes the felted fabric stronger and tighter. Felt that has not been properly fulled can shed and fall apart over time. After fulling, the felted fabric may be rinsed with cool water to remove any remaining soap and then left to air dry.
The felted fabric can then be used to make accessories or garments. 
Most felted fabric is made using a single color of fleece, but two or more colors can be used as well to create interesting blends of color.

Learn how to make the felted flower:
http://www.youtube.com/watch?v=ZpAQJt8u2B0

Learn how to make the felted shoes slippers:
http://www.youtube.com/watch?v=KgFqSFOALC8