Assuming you are referring to a type of synthetic leather made from polyurethane:
Yes, you can get pleather wet. In fact, it is often used as a material for raincoats and other types of clothing that need to be waterproof. However, if the pleather gets too wet, it can start to feel sticky and uncomfortable. It is also important to note that pleather is not breathable like natural leather, so it can cause sweating in hot weather.