I love my new queen TRIBECA LIVING sheet set. My microfiber 4 peace deep pocket sheet set is 100% polyester. There is one flat sheet, one fitted sheet and two standard pillowcases. The fully elasticized fitted sheet fits up to a 21” mattress. The deep pockets make it so easy to pull around the mattress with no struggling. The sheets have an ultra-soft brushed finish making your sleep so comfortable, I love the feel of them. The sheets are machine washable.