64% Acrylic, 20% Rayon, 16% Polyester
Although the yarn label says machine washable, the Caron web site changed to say it is not.
From the Caron web site:
WASHING INSTRUCTIONS Hand washing and drying: Turn inside out and wash gently in warm water using a mild detergent. Gently rinse well in cold water. Lay flat on a towel and roll in towel to remove excess water. DO NOT WRING, STRETCH OR HANG TO DRY.
HANDLING INSTRUCTIONS When using Jewel Box, be sure to tie a knot at the beginning of each skein and at both yarn ends when joining. A small amount of shedding can be expected when using this yarn under normal conditions.