Hi Robert101,
Thanks for the questions.
Bamboo or “bamboo from viscose” and eucalyptus “Tencel” are two similar textile fibers in the way they are grown and processed. Many very high quality textiles are made with both of these fibers. The legitimate supply chains use sustainably grown trees without insecticides and pesticides. The resulting fabrics have similar properties in terms of softness, durability and quality.
Phoenix has a nice summary in this post, which also includes other links for more info about fabrics.
The main difference between the two is the process used to transform the wood into a textile fiber. Tencel is the name of the fiber developed by Lenzing whose raw material comes from eucalyptus trees and is processed according to the lyocell process.
Generally speaking, these fabrics are of higher quality than cotton/silk/linen…if all other factors are considered equal. But in the world of textiles, there are low-quality mills making low-quality bamboo viscose, and high-quality mills making beautiful cotton products, so it is hard to keep all things equal. The site you have sent over certainly seems like they have a good knowedge of these fabrics. I do not have any other knowedge of this company.
Thanks again
Sensei