Viscose and shrinking, why it happens in the machine
Short answer: Viscose can shrink in the machine because the fibres soak up water, become weaker and pull together when heat and movement are added. It happens most at high temperature and hard drying. With gentle washing and air drying you can reduce the risk considerably.
Why does viscose shrink in the wash
Viscose fibres soak up a lot of water, and when wet they are softer and more fragile. When heat and movement press on them, the knit can pull together and the fabric becomes a little smaller. In addition, tension from manufacture can release at the first wash. That is why the care label matters.
Temperature and movement
The hotter the water and the harder the machine works, the greater the risk. Choose a gentle temperature and a programme with low spin. A full drum can also rub clothes more. Use a laundry bag for underwear so it is not dragged around. That reduces both shrinking and wear.
The tumble dryer is the big offender
Warm air and tumbling are the fastest route to a smaller garment. Viscose tolerates it poorly, especially at high heat. Let clothes air dry, preferably lying flat or hung on a hanger after gently pressing out the water. That keeps length and shape better, and you avoid shrinking.
Give the garment its shape while damp
When clothes come out of the machine they are soft and shapeable. Pull them gently into the right shape and length and let them dry that way. Do not wring hard, as that can stretch the fibres. If something goes wrong, a light pull when wet can sometimes help a little, but not always, so be careful.
The first few washes
New clothes can change a little at the first wash, when tension from manufacture releases. Follow the care label from the start and wash the pieces on their own the first few times. Choose size from the size guide and remember that small changes are normal and not a sign of poor quality.
What applies to underwear
Underwear fits close, and small size changes are felt quickly. That is why care matters. Wash gently, avoid the tumble dryer and let it air dry. Look at bamboo underwear for women and read the label in each piece, and you will know how to wash it.
What you should not promise yourself
No fabric is guaranteed free from shrinking, and two pieces from different brands can behave differently. Knit, blend and process matter. So it is best to follow the label and not test the limits. Compare with bamboo panties and other pieces you already have.
A simple routine that lasts
Wash at low temperature, spin low, take clothes out at once, shape them and let them air dry. That is the whole recipe. If you repeat it every time, the clothes keep their shape for longer. As a layer on the body, a women's long-sleeved bamboo T-shirt can be cared for in the same way.
Frequently asked questions
Does viscose always shrink in the wash?
Not always, but it can shrink at high temperature, with hard movement and in the tumble dryer. Follow the care label and let clothes air dry.
Can I stretch viscose out again?
A gentle pull when wet can sometimes help a little, but not always. It is better to prevent it with gentle washing.
Can viscose go in the tumble dryer?
It is often advised against, because heat and tumbling can make viscose shrink. Let clothes air dry and follow the label in the garment.
