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 placed at 90 degree angles to one another. 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.

Only certain types of fibre can be 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 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 fleece causes the scales to open, while agitating them causes them to latch onto each other, creating felt. Plant fibres and synthetic fibres will not felt.