Tumble drying and low temperature for underwear
Short answer: Bamboo underwear lasts longest if you wash it at a low temperature and avoid a hot tumble dryer. Always follow the care label in your pair. If you do use the dryer, pick the mildest programme and take the laundry out while it is still slightly damp.
Why heat wears underwear out
Heat makes fibres shrink and the elastic lose its spring. That applies especially to viscose from bamboo, which is soft but more delicate when wet. Repeated high heat can make underwear smaller and tighter, and the waistband goes slack.
The right washing temperature
Choose a low temperature, often around thirty or forty degrees, unless the care label says otherwise. It is gentle on the fabric and the elastic, and underwear gets clean enough at low heat if there are no stains. Use a mild detergent and not too much of it.
Turn inside out and use a net
Turn the underwear inside out so the surface rubs less against other laundry and the drum. A laundry net keeps them apart from zips and hooks that can snag the fabric. It takes a few seconds and makes a difference to how long they look neat.
Tumble dryer: yes or no
For the longest life, let your underwear air dry. If you are in a hurry, a mild tumble programme on low heat may do, but take the laundry out before it is completely dry. Always check the care label, because it applies to your pair.
Air drying without distortion
Lay the underwear flat on a drying rack or hang it by the waistband with some air around it. Avoid direct sun or a hot radiator, which can dry the fabric too harshly. Wet fibres are weaker, so lift them gently rather than wringing them out.
Fabric softener and stains
Fabric softener can leave a film on the fibres and make them less soft, so use it sparingly or not at all. Stains are best treated before washing, so you avoid an extra hot wash. Remove the stain with a little mild soap and lukewarm water.
Signs that underwear is worn
Look for a slack waistband, fraying edges, thinner fabric or a fit that has become smaller. These are signs that heat or hard washing has left its mark. Switch to a lower temperature and air drying, and see whether the next pair lasts longer.
Care for the whole wardrobe
The same rules apply to the rest of your bamboo clothes. Wash a bamboo undershirt for men and a bamboo T-shirt for men together with your underwear at a low temperature, so the whole set lasts longer. See also our bamboo underpants for men.
Frequently asked questions
Can bamboo underwear go in the tumble dryer?
It depends on the care label in your pair. Air drying is the gentlest option. If you use the dryer, choose low heat and take them out before they are completely dry.
What temperature should I wash underwear at?
A low temperature, often thirty to forty degrees, is a good starting point. Always check the care label and use a mild detergent without fabric softener, so the fibres stay soft.
Why does my underwear get smaller after washing?
Heat and rough treatment make the fibres shrink. Wash at a low temperature, avoid the dryer on high heat, and gently pull them into shape while they are wet.
