Bamboo viscose versus modal
Short answer: The two fibres are close relatives and behave almost the same. Modal is slightly stronger when wet, bamboo viscose slightly softer and cooler.
The same family
Both modal and bamboo viscose are regenerated cellulose fibres. The difference lies in the raw material and the process. Modal is usually made from beech wood with a process that yields a stronger yarn, bamboo viscose is made from bamboo.
Where the difference shows
Modal holds its shape better after many washes and shrinks less. Bamboo viscose feels cooler against the skin and drapes more heavily. In a blend you get both. See bamboo underwear for women.
What to look for on the label
If modal and viscose appear together, it is a blend of two close fibres and not an attempt to mislead. If it says only viscose, that tells you nothing about the raw material. See bamboo clothing for women.
Care is the same
Both wash at thirty degrees without softener and tolerate light tumbling. Both are weakest when wet, so avoid wringing. See bamboo t-shirts for women.
Frequently asked questions
Is modal stronger than bamboo viscose
Slightly, especially when wet. The difference shows most in clothes that are washed a lot.
Can you see the difference with the naked eye
Rarely. Both are smooth and have the same sheen in the fabric.
Which is cooler
Bamboo viscose feels cooler to most people, because it conducts heat slightly better.