# How to Felt Wool in a Washing Machine Without Losing Control Source: https://woolsculpt.com/blog/how-to-felt-wool-in-washing-machine Published: 2026-10-12 Publisher: Wool Sculpt To felt wool in a washing machine, put a 100% wool item that is not superwash in a zippered pillowcase or mesh bag, wash it on hot with a little detergent and something to add friction such as old jeans or towels, and check it every few minutes until it has shrunk to the size and density you want. A top loader is easier because you can stop and check mid-cycle. Front loaders work, but you have to run full short cycles and check between them. ## Which wool will felt Only animal fibers with intact scales felt: sheep's wool, alpaca, mohair and similar. The item or yarn must be at least about 85 to 100% wool and must not be labeled superwash or machine washable. Superwash wool has been treated so its scales cannot lock together, so it will not felt however hot the wash. Acrylic, cotton and most blends with a high synthetic share will not felt either. White and very pale wools sometimes felt more slowly, because some bleaching processes damage the fiber scales. Always knit and felt a swatch first, about 20 stitches by 20 rows, measure it before and after, and note how many cycles it took. That one test tells you how your yarn and your machine behave together. [Work out shrinkage](https://woolsculpt.com/tools/wet-felting-shrinkage-calculator) ## Step by step in a top loading machine Put the item in a zippered pillowcase or fine mesh laundry bag. This catches the loose fibers that shed during felting, which can otherwise clog the pump. Set the machine to the smallest load size, hot water and the longest agitation setting. Add a small amount of detergent, about a teaspoon to a tablespoon, and two or three old pairs of jeans or heavy towels that do not shed lint. They add friction and keep the load balanced. Check every 3 to 5 minutes. Take the item out, look at the stitches and measure it. Early on, it will look fuzzy and may even seem to grow. Then the stitches start to disappear and it shrinks quickly. Stop when you can no longer see individual stitches and it has reached the size you want, or when it is a little larger and finish by hand. Reset the dial to keep agitating rather than letting the machine drain and spin, because a hard spin can set permanent creases in felting wool. ## Step by step in a front loading machine Front loaders use less water and lock the door, so you cannot check mid-cycle. Use the same bag, jeans and a little detergent, and choose the hottest normal cycle with the shortest duration available, often a quick wash. Check after each cycle, reshape, and run another if it needs more. Many items need two or three cycles in a front loader. Some felters choose a lower spin speed to reduce the chance of creases. Because each cycle shrinks the piece in a single jump, felt a test swatch first so you know whether one cycle takes your project too far. ## How much will it shrink Knitted wool usually shrinks more in length than in width, because the stitches compress vertically more than horizontally. Many patterns plan for roughly 20 to 30% loss in width and 30 to 45% in length, but this varies a great deal by yarn, needle size, water temperature and machine, which is why the swatch matters more than any chart. Knitting loosely on larger needles than the ball band suggests gives the fibers room to move and helps them felt evenly. Tightly knitted fabric felts slowly and can end up hard and uneven. ## Shaping and drying Felt is soft and stretchy while wet, which is when you shape it. Pull it to size, stuff bags or slippers with plastic bags or towels, and set hats over a bowl or hat form of the right size. Pin flat pieces to a towel to square the edges. Then let it air dry completely, which can take one to three days for thick pieces. Do not tumble dry, which shrinks it further and unevenly. If the result is fuzzy, you can shave the halo off with a fabric shaver or trim with scissors once it is dry. If it is still too big, run another short hot cycle. If it went too far, wet it and stretch it while damp, though you will not gain back much. [See wet felting tools for hand finishing](https://woolsculpt.com/best/best-wet-felting-tools) ## Felting flat wet felt in the machine Wet felters also use the machine for the fulling stage of handmade flat felt or prefelt. Lay out and hand-felt the wool until the fibers hold together and pass the pinch test, then roll the piece in a towel, put it in a bag and run a short warm cycle. Do not machine felt loose layouts: the fibers will wash apart before they bond. Fine merino laid in two crossed layers usually fulls in one short cycle. [Compare wool for wet felting](https://woolsculpt.com/best/best-wool-for-wet-felting) ## Frequently asked questions Will felting wool damage my washing machine? The main risk is loose fibers clogging the filter or pump. A zippered pillowcase or mesh bag and cleaning the filter afterward prevent it. Can I felt wool in cold water? Very slowly if at all. Heat, moisture, soap and agitation together make wool felt. Hot water and agitation do most of the work. Why did my wool not felt in the washer? It is probably superwash, a high synthetic blend, or white wool that resists felting. Check the label and try a swatch. Can I felt an old wool sweater in the washer? Yes, if it is 100% wool and not machine washable. Felted sweaters are a common source of thick felt for mittens, bags and patches. ## Gear guides for this topic - https://woolsculpt.com/best/best-wool-for-wet-felting - https://woolsculpt.com/best/best-wet-felting-tools - https://woolsculpt.com/best/best-wet-felting-kit