SIMBA waterproof mattress protector with rubber. The polyurethane layer ensures breathability and easy airflow throughout the night, preventing the body from overheating, while perfectly blocking dust mites and other harmful allergens. It also ensures that your mattress is fully protected against dirt, moisture, stains and liquids. Prolongs the life of your mattress. The mattress protector is made of super soft 100% cotton and can be washed at 90C.