Originally developed by the Inuit, the indigenous peoples living in the Arctic regions of North America and Greenland (the word 'kayak' means 'man's boat'). A type of small human-powered boat; a covered variant of a canoe, typically used with a double-bladed paddle instead of a canoe's single bladed paddle. The user or paddler sits down in the kayak with feet facing forward. The top of the kayak is covered with a deck. The paddler sits in a hole in the cockpit which may be sealed off with a spray skirt (or spraydeck). In modern times kayaks have been further developed into several types including: whitewater, playboats, surfing, sea kayaks, flat-water racing, downriver racing, slalom, canoe polo and recreational. These types may also be subdivided. Modern kayaks are made of plastic, fiberglass, kevlar, carbon fiber, canvas, other fabrics, or wood. They come in one, two, and occasionally three person models. Some sit-on-top boats are also called kayaks, as the paddler propels the boat with a double-ended paddle.