This brand started being aware of the problem of plastic pollution in the oceans. Implementing industry standard polyester or Rpet thread was not an option as we keep the same problem about the biodegradability of the garment. Organic cotton is still neither an option nor has not enough thickness for outside seams; we hope we can use it in the future. Lyocell is fully biodegradable and provides the strength we need. Our tree fiber is sourced from South African silviculture plantations that minimize fertilizer and rely on rainfall, not irrigation. Anyway, we are aware lyocell is the best option we have found but not a justice led circular design option. The thing with eucalyptus is that local agriculture competes for water with these plantations, and FSC doesn’t restrict pesticides.
”Besides endorsing the destructive conversion of the natural habitat, cultivated fields and livestock pastures, the certification of tree plantations by FSC also legitimises ‘management practices’ that are used to deliberately harm or destroy natural flora and fauna. For example, after trees have been planted, toxic herbicides are used to eradicate biodiversity rich native vegetation that might compete with the plantation trees for water and nutrients. This also exposes the soil to erosion and the loss of biological carbon. Chemical pesticides are also applied to control insects and rodents that might eat the young trees after their natural food has been poisoned. But even worse is the killing of larger mammals such as baboons, which are eradicated by shooting, trapping or setting poisoned baits” 
Lyocell TENCEL™ fiber is a man-made cellulosic fiber. It is made by chipping wood and processed into pulp before being processed into fibers. The process developed by Lenzing involves direct dissolution of cellulose pulp in an organic solvent, without any chemical change and recovers more than 99% of the solvent in a closed loop. On the other hand, viscose, rayon and bamboo use toxic solvents called sodium hydroxide and carbon disulphide in an open system.