Hello T73,These sheets are made of 65% cotton, 35% lyocell, and feature 100% polyester side panels. We stand behind all our products with a 100% Member Satisfaction Guarantee, so if you’re not satisfied, please don’t hesitate to reach out to our Member Support team at (888) 301-0332. You’re also welcome to return the sheets if they don’t meet your expectations.Your feedback is incredibly important to us, and we’re constantly working to improve. Thank you again for sharing your thoughts!Thank you, Welspun