48% cotton/48% modal/4% spandex. The cotton is certified organic. TENCEL™ Modal is sourced from certified forests and using a closed-loop system and is produced by using renewable energy and by recovering the process chemicals. It is a good, sustainable choice. The dyeing process and print are certified to be environmentally friendly. Machine wash warm, delicate cycle. Stretch gently to length while damp. Do not tumble dry. Shrinkage 3-4%. Made in Sandanski, Bulgaria.