Do not buy Earthing Sheets from Earthing Institute.
The quality is extremely poor.
I bough one 1.5 year ago, and it worked only for 1.5 months. Then I sent it for repair, and after that it worked even less - for 1 month.
My friend had the same problem. We sent several requests asking for explanation, and we did not have a response.
I am not arguing that Earthing is not beneficial for human body, it is just the quality of the product is very poor.... Please be aware. Do not waste your money.