When textile materials are dyed in this way, chemical use is reduced by more than 90%
Conventional dyeing means weaving or stitching a white fabric and then dyeing it to the color you want in a large, hot color bath. This consumes a lot of energy and water and requires adding a lot of chemicals – unless properly cleaned it also severely pollutes the local environment.
But there is a dyeing technique that has been around for a while where you add the pigment already at the fiber level instead.
We call it ”solution dye”, it's also called ”spin dye” and ”top dye.” The name is of less significance. More importantly, when textile materials are dyed in this way, water use is reduced by almost 50%, chemical use by more than 90% and energy use by more than 60%. Further up-sides are improved color fastness as the material has the same color all the way through, and that you can make it more durable because you don’t need to create a surface where a pigment added later can stick.
A downside is that minimum quantities are much higher, so it requires more unification of colors and materials used.