A tarpaulin or tarp is a large sheet of strong, flexible, water resistant or waterproof material, often cloth such as canvas or polyester coate with plastics such as latex or PVC. In some places such as Australia, and in military slang, a tarp may be known as a hootchie. Tarps often have reinforced grommets at the corners and along the sides to form attachment points for rope, allowing them to be tied down or suspended. Inexpensive modern tarps are made from woven polyethylene; this material is so associated with tarps that it has become known as polytarp.