The Aller Bug™ mattress encasement’s innovative stitching design encases the mattress entirely and prevents bed bug entry or escape. The fabric is water proof and breathable which makes for an allergy free sleep. Cleaning Instructions: Please wash and tumble dry the protector before using it the first time as this softens the product, improves the flexibility and eliminates any packaging odors. Washing: Please do NOT use any bleach, bleach alternatives, non-chlorine bleach or any bleach by-products in the detergent, as this will destroy the polyurethane lining. The Protector can be washed in hot water. Please do NOT dry clean. Drying: Please dry together with some other bed linen or towels. The protector can be tumble dried on a medium heat for about 40 minutes (longer if needed – depending on your dryer). Careful drying will prevent blistering of the lining. If blisters do form from overheating of the dryer, please discontinue using the protector, as these blisters will split open and lead to the protector leaking.