Enjoy the healing benefits of grounding all night long with the Ground Therapy Sleep Mat. The updated Sleep Mat is designed with a thinner, perforated 100% conductive carbon leatherette that feels great with direct skin contact or becomes nearly unnoticeable from under your fitted sheet- now available in a larger size! The conductive side is the smooth, leather-like material and should be placed up, nearest direct skin contact as possible. Use the straps to secure the mat directly to your mattress over or under your fitted sheet to turn your bed into an indoor grounding sanctuary. The single sleep mat covers a twin size mattress and the queen mat covers the entire surface area of a queen-sized bed.