Fabric softener is the most common mistake with bamboo

Short answer: Softener leaves a film on the fibres that makes fabric less absorbent and elastic slack. Bamboo viscose is soft already and does not need it.

What softener does to the fibre

Softener works by laying a thin layer of fatty material around each fibre. It feels smooth, but the layer also seals the fibre surface. The ability to move moisture away from the skin drops, and that is exactly the property you buy bamboo viscose for.

The consequences you notice

Towels stop absorbing, underwear feels clammy rather than dry, and waistbands go slack sooner. Odour also settles more easily, because the soapy layer traps bacteria instead of releasing them in the wash.

What to use instead

If you want softness, use a cup of white vinegar in the softener drawer. It removes soap residue and limescale without adding anything to the fibres. Dry laundry does not smell of vinegar. See bamboo underwear for women.

How to strip the film off again

Wash the items twice with no detergent, first with vinegar and then on their own. Most of the layer rinses away, and both absorbency and elastic improve. See bamboo towels and bamboo socks for women.

Frequently asked questions

Is softener always wrong

For bamboo viscose yes. The fibre is soft already and only loses properties from it.

What about tumble dryer sheets

Same problem. They leave a coating that makes the fabric less absorbent.

Can softener be used on bedding

It is not advised for the same reason. Bedding needs to absorb moisture overnight.