Phiten Home Collection 400 Thread-Count 100-Percent Cotton 4-Piece King Sheet Set, Blue Cotton Features revolutionary technology that helps your body relax and actually works to restore lost energy by balancing your natural energy system while you sleep, giving you an ultimate nights rest and recovery These sheets and pillowcases feature phiten aqua-titanium technology that is permeated into the material just like dye and actually becomes part of the fabric and cannot be washed out or fade away Woven from an incredible 400 thread-count, 100-percent heavy weight cotton that has been mercerized providing beautiful sheen, higher luster, increased durability and are smoother to the touch Set includes an extra wide 108 by 102-Inch flat sheet; two 20 by 40-Inch king size pillowcases with european flap closures and a 78 by 80-Inch fitted sheet Fitted sheet fits mattresses up to 18-inch deep and has elastic all around to eliminate shifting and bunching; machine wash warm, tumble dry medium