A rigid inflatable boat (RIB), also known as a rigid-hull inflatable boat (RHIB), is a lightweight but high-capacity boat with a rigid hull bottom joined to side-forming air tubes that are inflated with air to a high pressure to give the sides resilient rigidity along the boat’s topsides. The design is strong, light, fast, and seaworthy. The inflated collar acts as a life jacket, keeping the boat afloat even when it is taking on water. The RIB is an evolution of the inflatable boat, with a rubberized fabric bottom stiffened by flat boards within the collar to form the deck or floor of the boat.