Grounding sheets are made with silver threads that connect with the earth through a plug to provide a number of health benefits affecting inflammation , sleep, etc. You feel the effect when walking barefoot on bare ground. This one is well made with plugs on either side (see photo) for convenience. I tried this for a week but I can't sleep on non-flannel sheets. I get super sweaty and thrash all night in regular sheets. That was a $100 mistake on my end - works well for you!
Comes with their little booklet too. Like new.
Here is some research provided by the National Institute for Health (NIH) on them:
The effects of grounding (earthing) on inflammation, the immune response, wound healing, and prevention and treatment of chronic inflammatory and autoimmune diseases - PMC