Solid surface is a non-porous, renewable, low-maintenance countertop surface. A man-made product. Solid surface can be cast into a variety of shapes, including sinks, shower surrounds, shower pans and even bathtubs. Because Solid Surface material is moldable by being heated up and molded into different shapes, this is called Thermoforming. This is most commonly known as "coving" in a corner of a shower surround or in the seam where countertop meets backsplashes.