The set with the pillowcase is recommended so that you get an even surface of grounding over your entire body. Grounding works best close to the point of contact, or it should be the soles of your feet connected to all your organs, feet grounded (to the ground), but that is difficult while sleeping.With a grounding pillowcase you give a more direct input of the earth’s electrons (antioxidants) around your head, neck, and upper back to achieve a faster balance.Pillowcases are also easy to take with you on a trip so you can stay grounded and get the most out of your sleep.