A raincoat is a waterproof or water-resistant garment worn on the upper body to shield the wearer from rain. The term rain jacket is sometimes used to refer to raincoats with long sleeves that are waist-length. A rain jacket may be combined with a pair of rain pants to make a rainsuit. Rain clothing may also be in one piece, like a boilersuit. Raincoats, like rain ponchos, offer the wearer hands-free protection from the rain and elements; unlike the umbrella. Modern raincoats are often constructed from waterproof fabrics that are breathable, such as Gore-Tex or Tyvek and DWR-coated nylon. These fabrics and membranes allow water vapor to pass through, allowing the garment to 'breathe' so that the sweat of the wearer can escape. The amount of pouring rain a raincoat can handle is sometimes measured in the unit millimeters, water gauge. Early history One of oldest examples of rainwear recorded is likely the woven grass cape/mat of Ötzi, around 3230 BCE. The Olmec Native Americans first invented rubber sometime before 1600 BCE. They developed methods to extract natural latex resin from the rubber tree (Hevea brasiliensis), and cure the latex resin into stabilized rubber using the sulfuric compounds of the morning glory in order to create some of the world's first waterproof textile fabrics using cotton and other plant fibers. These rubberized fabrics were crafted into waterproof cloaks, direct precursors to the modern raincoat, as well as other waterproof clothing like shoes. The indigenous peoples of the Northwest Pacific Coast wore raincoats and other clothing made of woven cedar fiber which, depending on the tightness of the weave, could be dense and watertight, or soft and comfortable. Throughout much of Eastern and Midwestern regions of North America, many Native American nations used treated leather from a variety of animals to create waterproof clothes, sometimes covered in fringe, to stay warm and dry. In addition to the decorative function, fringe would pull water off the main portion of their clothes so that the garment dried quicker. The particularities of the Arctic climate gave rise to a distinctive culture of waterproof clothing. The Inuit, Aleuts, and many other peoples in the Arctic region have traditionally worn shirts, coats, and parkas made from the skins of seal, sea otter, fish, and birds. Birdskin shirts, with the feathers on the outside, provide excellent protection from rain as they repel moisture. In Aleut culture, a