This is the luxury version of our wonderfully soft and natural cotton mattress pad. It will protect your mattress and provide excellent cooling comfort at the same time. The secret is breathability - the 500TC cover and extra fill are both of 100% cotton. Beacause cotton breathes so well, it doesn't radiate back heat like synthetic pads do. This means a cooler, more restful sleep for you. Stretch to fit side walls, machine washable, long lasting.