a reinforced panel , made of a composite material , includes a single base layer . a first plurality of mutually parallel ridges is affixed to the surface of the base layer . a second plurality of mutually parallel ridges is also affixed to the surface of the base layer , but oriented transverse to the first plurality . structurally , the ridges and the base layer are co - cured to create an integral , continuous structure that provides stiffness and rigidity to the panel .