This is a genuine US military surplus poncho, made of heavy-duty tear-resistant nylon ripstop material. They are water repellent, have an attached hood, and have snap fasteners for closing and metal grommets.
These ponchos have been previously used and issued by the US military, and are in overall good condition still. These are heavily used with a white powdery substance coating the poncho. These also have an unpleasant odor that should go away if the poncho is cleaned.