Phiten Home Collection 400 Thread-Count 100-Percent Cotton 2-Piece Standard Pillow Case Set, Blue 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 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 two 20 by 30-Inch standard size pillowcases with european flap closures Coordinating phiten sheet sets also available thru Amazon; machine wash warm; tumble dry medium