Bamboo fibres, 100% bamboo. Not Viscose.
Bamboo yarn is a cellulose fibre which is extracted from naturally grown bamboo. It is the fifth largest natural fibre after cotton, linen, wool and silk.
Bamboo has a hollow micro fibre structure allowing it to be naturally warm yet breathable. It is both cool in the summer and warm in the winter. Bamboo yarn is environmentally friendly, 100% chemical free and 100% biodegradable.
It is also super soft so if you just want it to bury your face in it, it works.