Rayon has very thin fibers, which allows it to breathe more than other fabrics and gives it a lightness that prevents it from sticking to a body in hot weather. Since it is so comfortable and cooling to wear, rayon is an especially good fabric for sportswear and summer dresses.
When you machine-wash a rayon item, turn it inside out and put it in a mesh washing bag. Wash it in cold water on the delicate cycle with a low spin cycle. It's best not to machine-dry a rayon item, as it can destroy the fabric. Just hang dry.