Marpac Sheets are premium super-soft 600 thread count cotton blend sheets that feel silky-smooth and cool next to your skin. The fitted sheet has special “Universal Smooth Elastic” plus 18-inch deep pockets which means that making your bed is a snap and the bottom sheet stays put. They are also guaranteed to fit any bed in your house. Wrinkle-Free technology gives your sheets that crisp, fresh-from-the-laundry look and feel every day and the ivory color looks great with any decor. Sheet sets include 1 fitted sheet, 1 flat sheet and 2 pillow cases (1 pillow case with twin and twin XL). Please note that the king sheets include 2 king size pillow cases.