The skimboard is a craft of varying size, usually of some oval or teardrop shape, though some people use circular boards. They are typically made with a core of varying compositions of laminated wood or polystyrene foam, covered by a shell of GRP and/or various types of plastic, fairly rigid and relatively dense: compared to a surfboard or bodyboard of similar area it is not very buoyant. It is rare to see a skimboard thicker than 2.5 cm. A well made skimboard will have some nose lift and perhaps even some rocker, and may come with a rubberized traction surface