KFO Pure Silk is made of 100 % bourette silk. Bourette silk is made of silk waste created during silk processing. The short, leftover silk fibers are spun into a new yarn. It has a rustic and uneven look and is less shiny than other types of silk. This is the perfect yarn for summer tops and summer dresses, but it will also make a luxurious sweater combined with our Soft Silk Mohair.