The bodyboard differs from a surfboard in that it is much shorter (typically 100 to 110 cm (39 to 43 in) in length) and made out of different types of foam. The modern board consists of a foam 'core' encapsulated by a plastic bottom, a softer foam top known as the deck, and softer foam sides known as the rails. The core is made of dow/polyethylene, arcel, polystyrene, or Polypro/polypropylene. The bottom is made of Surlyn, HDPE or Bixby. The deck is made of 8LB or CrossLink. Each type of foam core, deck, or bottom material gives a bodyboard a different amount of flex and control. Speed from the bottom turn is increased when a bodyboarder bottom turns and the board flexes and recoils, releasing energy. If the board flexes too little or too easily, speed is lost. Dow (polyethylene) cores are best suited to cooler waters as they can be too flexible in warm water. Arcel and Polypro (polypropylene) cores are best suited for warmer waters due to their increased overall stiffness.
on the market today contain one, two, or three rods (usually of carbon or
graphite), referred to as stringers, to strengthen the board, reduce
deformation, add stiffness and recoil to the core, thus providing greater speed
off bottom turns and transitions on the wave. If a single stringer is used, it
is placed in the center of the board running parallel to the rails. If two are
used, they are placed symmetrically about the y-axis. Triple stringers are a
combination of the placement of both a single and double stringer.