Polyurethane Leatherette SAFE & NON-TOXIC MATERIALS: This Grounding Pillow Cover is made with eco-friendly and non-toxic materials. It utilizes a proprietary blend of vegan leather vinyl-free PU resin that’s infused with carbon pigment. EASY TO USE: First, test your wall outlet with the included Outlet Checker to make sure it's grounded. After that, push the Safety Adapter into it. Next, slide the grounded pillow case over your standard size pillow. Snap the Coil Cord to the connector tab inside the Pillow Cover. Then, push the other end of the cord into the Safety Adapter. Lay down on the Earthing Pillow Cover and you're grounding! COMPLETE KIT: 1 Grounding Earthing Pillow Cover, 1 Coil Cord with in-line current limiting 100k ohm resistor (15'), 1 U.S. Safety Adapter, 1 Outlet Tester, PLUS a FREE copy of the book 'Earthing: The Most Important Health Discovery Ever!' CLINT OBER OFFICIAL: Earthing products are the official grounding products of Clint Ober. They are patent-protected and come with a one year manufacturer's warranty. REQUIRED TO USE: Properly grounded Type B (North American style 3 prong) outlet, or Ground Rod (not included). The Earthing Elite Pillow Cover envelopes your regular-size pillow to easily get you grounded while you sleep. It’s made from our proprietary Earthing Elite grounding material - the culmination of two decades of research and development. It’s 100% conductive, easy to clean, and very durable.