They were described as cotton, they were however, microfiber. The description said the fitted sheet would fit a 14 inch mattress..mine is 10 and it wouldn't cover the fourth corner, When I searched sheets I checked cotton only so I assumed they would be cotton. The picture depicts black sheets and shams.. the whole set was the winged cross design. The sheets were super soft though. Beautiful set, but I was hoping for black sheets and all cotton. They are more suited for teens.