The mat can be used in different locations, and with or without a mat cover.
When used in bed, some people don’t like the feel of the mat on their skin. In that situation, you can insert the mat into the fabric cover sleeve, and use it in bed. Make sure you connect the mat with the provided Earthing cord.
Only one side of the mat cover is conductive. It is the side with the grid pattern of conductive silver fibers. The other side is not conductive.
Similarly, only one side of the mat is conductive. It is the side on which you snap on the Earthing cord. The other side is not conductive.
When you make bare skin contact with the conductive side of a connected mat, or with the conductive side of the mat cover with a connected mat inside of it, you receive the energy from the Earth.