A raft frame (used for inflatable boats rowed or paddled on rivers) is a flat metal (typically aluminum) structure that fits on top of a raft and provides compartments for storage (such as dry boxes and coolers), fittings for the oars, anchor points for strapping on gear, and add-on components such as seats and biminis (sun shelters). Although raft frames are usually used for rafts that are rowed, frames are available for paddle rafts, too, providing storage across the center of the boat while leaving room for paddlers.