Eco-friendly knits are biodegradable fabrics that do not pollute the environment (much; all textiles do pollute to some extent). Bamboo knits belong to this category of eco-friendly knits. They are soft and very comfortable on the body and naturally eco-friendly as well. Cupro is made from cotton cellulose. it is a very comfortable fabric - moisture-wicking, and lightweight Modal is a variety of rayon - it is made of cellulose and hence considered an eco-friendly option. It is a soft, lightweight natural fabric