The all natural Christopher Knight Home rayon from Rayon Made from Bamboo mattress protector by Greenzone Sleep has a 15" fitted side panel insert. Top panel is rayon from Rayon Made from Bamboo Jersey. 100percent waterproof and water repellent. This mattress cover provides a protective barrier for your mattress against dust mites and other allergens. Care: Machine washable. Tumble dry on medium heat. Do not bleach or dry clean.