QD0221 Size: Twin Features: -Material: 100pct Polypropylene.-King and California King size include 2 pieces.-Clean and hygienic sleeping environment.-Protects box spring from bed bugs, dust mites, allergens and pet dander.-Complete surround box spring encasement to protect from stains.-Machine wash warm and tumble dry. Options: -Available in several sizes. Warranty: -30 Days warranty.