This mattress protector features a smooth poly surface, designed to fully encase the entire mattress, which is perfect for severe asthma and allergies, due to the anti-allergy flap, which creates a barrier against dust mites and bed bugs. Line dry, or warm to max tumble dry at 60°C with other linens or towels. Dry thoroughly before re-use or storage. Do not bleach, iron, dry clean, or use solvents.