Another similarity between modal and lyocell is how it’s made. As with the former, lyocell begins with wood; predominantly from fast-growing trees such as birch, eucalyptus and oak. The wood is harvested and ground into a pulp and mixed with a chemical which leaves a sticky liquid. This is then filtered and pumped through spinnerets - thimble-shaped devices used to form fabric strands - resulting in long, thin fibres. These fibres are then washed, dried and separated before being cut into the desired length.