Image Description: A memory foam mattress topper lies flat on a speckled concrete floor. On top of the memory foam is a thin clear plastic office chair mat with a lip. The image shows a close up of the lip which is a rectangular shape protruding from one edge of the mat and is intended to fit under a desk. The foam has been cut to match the dimensions of the chair mat. Sunlight shines from the right across the chair mat and illuminates the ventilation holes and the sweat stains which have turned the surface of the foam from the light blue color visible along the edges to a dull yellow green color.