This is a 4 piece set that includes a fitted and flat sheet and 2 pillow cases. I like these sheets a lot they are a cotton/polyester blend so they will be good for both summer and winter. These are 1200 thread count and are very well made and the stitching is good, no loose threads. They were so soft right out of the package however, I washed them and added fabric softener to the rinse when I got them, which is what I do any time I get new sheets. They came out of the dryer so soft and with minimal wrinkles which was not noticeable once I put them on the bed and they look very nice. I like the elastic on the fitted sheet and it keeps the sheet securely on the mattress. It fits my mattress really well and will fit up to an 18” mattress. They are not stiff and are so comfy and soft. I love the quality of these sheets.