From Target's site: The soft and breathable lyocell satin fabric helps you get a comfortable night's sleep, while the fully elasticized fitted sheet lends a secure fit around an 18in mattress. Best of all, you can simply toss this set in the washing machine for easy cleaning. Highlights: *Satin lyocell sheet set *320 thread count *Top and bottom labels for easy placement *Moisture wicking to keep you cool and dry throughout the night *Includes pillowcase(s), 1 flat sheet and 1 fitted sheet *Made in Green by OEKO-TEX *Forest Stewardship Council Certified