The best bamboo sheets in the world are by Fiber Element.
Made from 100% Bamboo viscose rayon meaning they are purely bamboo and don't have any other cheap materials added. If a company is selling bamboo sheets and they don't say 100% viscose then they are selling garbage blends that are worth about $10 for the set. Don't be fooled by companies claiming to be 100% bamboo, they need to be certified by Okeo-Tex to be pure bamboo.
Bamboo requires less than 10% of the water that cotton requires to grow and it's self sustaining and naturally grows back without the labor cost needed to replant.
The best bamboo sheets in the world are Fiber Element brand, hands down. Also the coolest sheets temperature. Bamboo is naturally cooling so it will keep you nice and cool while you sleep.
Softest sheets in the world are the bamboo 100% viscose (rayon) by Fiber Element.