Never used- still in package. Bought as gift but changed mind. Look up grounding sheets for info on potential health benefits!!! From the Grounding website: "Earthing, or grounding as it is often called, connects you to this overlooked natural energy that nurtures and balances your body at the deepest levels, draining it of inflammation, pain, stress, and fatigue. We created Grounding™ for you to easily enjoy all of the healing benefits of earthing without having to spend the extra time walking barefoot on the ground for hours each day. You can now sleep and heal."