Wool’s a great material. It’s cosy, it’s comforting, it’ll keep you warm in the autumn and winter. It’s also prone to shrinking, which is great if you want to know how to shrink wool, but not so great when you’re frantically Googling ‘how to unshrink merino wool sweater’. Here’s our guide to both how to shrink and how to unshrink a wool jumper or any other woollies that are giving you trouble.
Why does wool shrink?
Wool is a natural fiber that has a tendency to shrink when exposed to certain conditions. The main reason for wool shrinkage is the presence of heat, moisture, and agitation. When wool fibers are subjected to these factors, they can interlock and become tightly packed together, resulting in the fabric shrinking. Additionally, the scales on the surface of wool fibers can latch onto each other, further contributing to shrinkage. To prevent shrinking, it's important to follow the care instructions for wool garments, such as washing them in cold water, avoiding excessive agitation, and laying them flat to dry.
Key Steps
If you want to know how to shrink or how to unshrink wool:
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To shrink, agitate the wool in a warm environment, either by hand or in a tumble dryer.
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To unshrink, relax the fibres with fabric conditioner so you can stretch the wool out by hand.
How to Unshrink Wool with Salt
Start by filling a sink or tub with lukewarm water. It’s important to use water that is not too hot, as hot water can shrink the wool fibres further. Add a tablespoon of salt for every litre of water used.Place the shrunken wool garment into the saltwater solution. Gently agitate the water, with your hands, to make sure that the saltwater is evenly distributed, and that the wool absorbs it.Allow the wool to soak in the solution for at least 30 minutes - the longer, the better. The saltwater will help to relax the wool fibres, making them less tense and easier to stretch.Remove the wool garment from the water and carefully squeeze out the excess moisture. Then, place it onto a flat, clean towel.Stretch the wool garment back to its original shape. Gently tug and pull it into the desired shape, making sure that you don’t pull too hard as this could damage the wool fibres. Your garment should be damp, but not soaking wet at this point.Leave the garment to dry on a flat surface, carefully reshaping it as it dries. This may take a few hours or even a whole day, depending on the size of the item. It’s essential to leave it to dry naturally, as machine drying can cause the wool fibres to shrink again.
How to Care for Wool Clothing
Caring for wool clothing requires a delicate approach to maintain its quality and longevity. Start by reading care labels for specific instructions. Hand wash in cool water with a mild detergent, avoiding harsh agitation. Gently squeeze water out without wringing. To prevent stretching, lay flat on a towel to air dry. Use a steamer or iron on low heat to remove wrinkles. Store in a cool, dry place with proper ventilation, preferably folded to prevent stretching on hangers. Regularly brush off any surface debris. With mindful handling and occasional professional cleaning, your wool garments can remain soft, warm, and stylish for years.
This can even be used as a method for how to unshrink merino wool. Now that you know how to shrink and how to unshrink wool, you might be wondering how to deal with other materials. Never fear! We have more general guides on how to shrink clothes and how to unshrink clothes, for all your sartorial sizing adjustments!
