Bamboo underwear and how it behaves after many washes

Short answer: After thirty washes, it is the elastic that has changed, not the fabric. The bamboo viscose itself gets softer over time, while the elastane slowly loses its stretch, and that is what decides when a piece is worn out.

The fabric gets softer

The fibres grow more flexible over time, and the briefs feel softer than when they were new. That is a benefit rather than wear, and it is why well worn briefs are often the ones you reach for first. Many find that bamboo underwear only truly settles in after a few washes. See bamboo briefs.

The elastane loses stretch

Elastane breaks down from heat, chlorine and time. That is why the waistband goes slack before the fabric wears through. It happens gradually, so you rarely notice it from one day to the next. Suddenly the briefs sit a little lower or ride up a little more. Read about preserving the stretch under washing and care.

What heat does

Heat is the worst enemy of elastane. A hot tumble dryer or a high temperature wash breaks down the stretch much faster than normal wear. That is why air dried underwear often lasts much longer than underwear dried on high heat. It is the single habit that matters most for how long it lasts.

Colour over time

Dark colours can fade a little after many washes, and light colours can turn greyish if washed with dark ones. Wash by colour and use a mild detergent. Turn your underwear inside out, so the surface wears less in the drum. Small habits keep the colour looking good for longer.

How to extend the period

40 degrees, no fabric softener, and air drying or low heat. Those are the three steps that work. A laundry bag helps too, so the briefs do not wrap around other clothes and get stretched in the drum. It takes no longer than washing without one, yet it can add many months. See bamboo underwear for women.

Rotate between several pairs

With several pairs to rotate, each pair gets more rest and is washed fewer times a year. That spreads the wear and means the whole drawer lasts longer. A pair you wear twice a week naturally wears faster than one you wear every other week.

When it is done

If the waistband does not spring back when you pull and release it, the piece is done. The same goes if the leg edges have gone wavy and no longer lie flat. The fabric may still look fine, but the fit is gone. Measurements for replacements are in our guide to briefs and underwear.

What not to worry about

A little fluff or a softer surface after many washes is normal and not a sign that anything is wrong. The fabric changes, but that does not make the briefs worse to wear. The elastic is what to watch. As long as it springs back, the briefs can stay in use.

In short

Bamboo underwear gets softer over time, while the elastane slowly gives in. Wash at 40 degrees, skip fabric softener, dry on a line and rotate between several pairs. Test the waistband by pulling and releasing. If it springs back, the briefs still have many washes left in them.

Frequently asked questions

Does bamboo underwear get softer over time?

Yes. The fibres grow more flexible, and the fabric feels softer after a number of washes. Many find it only truly settles in after its first few rounds in the machine.

What gives out first?

The elastane in the waistband. It breaks down from heat, chlorine and time long before the fabric wears through, so the waistband decides when the briefs are worn out.