Rayon is a synthetic fabric made from polyester, nylon, and spandex. It is lightweight yet strong, making it ideal for activewear, such as running shorts and t-shirts. Rayon is breathable, wrinkle-resistant, and quick-drying, making it a great choice for activewear that needs to be comfortable and durable. It is also resistant to fading and shrinking, so it will keep its shape and color for a long time.