How to Felt a Cashmere Sweater With Boiling Water

Learn how to intentionally felt a cashmere sweater using boiling water for a unique, denser fabric.

1. Understanding the Felting Process

Felting, also known as fulling, is a process that causes wool fibers to interlock and mat together, resulting in a denser and less flexible fabric. This occurs when wool is subjected to moisture, heat, and agitation. Cashmere, being a type of wool, can also be felted. Intentionally felting a cashmere sweater can be a way to repurpose a garment that might have been too large, or to achieve a different texture and appearance. However, it’s crucial to understand that this process is irreversible, and the sweater will shrink.

2. Preparing Your Cashmere Sweater

Before beginning the felting process, it’s essential to properly prepare your cashmere sweater. First, ensure it is clean. Wash it according to the care instructions. Any dirt or oils can interfere with the felting process. Secondly, assess the size and shape of the sweater. Consider how much you want it to shrink and the desired final outcome. If you only want to shrink it slightly, you may want to use a lower temperature.

3. Gathering Your Materials

You’ll need the following materials for felting your cashmere sweater:

4. The Boiling Water Technique

1. Boil Water: Bring a large pot of water to a rolling boil. The amount of water should be enough to fully submerge the sweater.
2. Submerge the Sweater: Carefully place the clean, cashmere sweater into the boiling water. Use tongs or gloves to avoid burning yourself. Ensure that the sweater is fully submerged, and there are no air pockets.
3. Agitate Gently: Use tongs to gently agitate the sweater in the hot water. This will help the fibers to start intermingling and locking.
4. Soak: Allow the sweater to soak in the boiling water for 5-10 minutes. The exact time needed will depend on the desired level of felting and the thickness of the cashmere. Thicker garments may need a longer soak time.
5. Check Periodically: Every few minutes, check the sweater for the desired level of felting. You can gently pull it out of the water (using tongs) to check its progress. Be careful as it will be very hot. The fibers should feel denser and start to become more matted.

5. Agitation and Further Felting

If the sweater has not felted to your liking with the initial hot soak, you can increase the agitation.

1. Increase Agitation: For additional agitation, you can carefully remove the sweater from the boiling water and, while wearing gloves, squeeze excess water out, but don’t wring it. Then, while wearing gloves, rub it gently. Alternatively, you can place it into a washing machine and run it on a hot cycle with a short spin. Note, that if you use a washing machine, avoid putting it through a full spin cycle.
2. Rinse: Once you have reached the desired level of felting, rinse the sweater thoroughly in cool water to remove any residual hot water and soap if you used any.

6. Drying Your Felted Cashmere Sweater

Drying the felted sweater is as important as the felting process itself. Incorrect drying can cause misshaping and further shrinking.

1. Blot Excess Water: Gently squeeze as much water as possible out of the sweater, but do not twist or wring it. Then lay the sweater flat on a clean, absorbent towel.
2. Shape the Sweater: Gently reshape the sweater to its desired form. You can stretch it slightly if it has shrunk more than desired. Be cautious, as it may not return to its original size, but gentle manipulation can help.
3. Air Dry: Allow the sweater to air dry flat. Do not use a dryer or hang it as this may cause misshaping. Avoid direct sunlight or high heat as they may damage the fibers. Turn the sweater over periodically to ensure even drying.

7. Final Considerations

Once completely dry, your cashmere sweater should be significantly smaller and denser than before. The fibers will be interlocked, resulting in a less flexible and more compact fabric. The felting process can create a unique texture that is more resistant to fraying. While it is not possible to restore it to its original state, you will now have a repurposed item to wear or use. Experimenting with different times, temperatures and levels of agitation during the felting process can lead to a variety of desired results.