The Mainstays NexGen Waterproof and Anti Allergen Fitted Mattress Protector in Twin size is a solid white product made of polypropylene material. It is designed with a waterproof feature, making it suitable for all seasons. The mattress protector has a zipper closure and is suitable for teens and kids in the bedroom. With its art nouveau style and anti-allergen properties, this product provides a clean and comfortable sleeping environment.