We use certified Egyptian Cotton for our 500 thread count sheets and duvet covers. Egyptian Cotton is extra fine long staple fiber, this allows us to weave a super smooth sateen fabric that is softer, stronger and more luxurious than ordinary cotton sheets and duvet covers. Our Egyptian Cotton 500 thread count sheets and duvet covers will give years of superior comfort and durability. This collection also comes with matching sheet sets that will complement any bed! Please click here: 500 Thread Count Egyptian Cotton Hemstitch Sheet and Pillowcases Twin/Twin XL Duvet Cover Set 2pcs. 1-Duvet (68"X90"), 1-Standard Sham (20"X26") Full/ Queen Duvet Cover Set 3pcs. 1-Duvet (90"X90"), 2-Standard Shams (20"X26") King Duvet Cover Set 3pcs. 1-Duvet (108"X90"), 2-King Shams (21"X37")