A mattress protector helps to protect your mattresses from not just dust and moisture but also the problems and allergies that occur because of these. Moisture can cause fungus and mold to grow on the mattress making smell musty. It is a well-known fact that mold and mildew can cause serious allergies in people. Dust settles into the mattress and becomes a breeding ground for house dust mites which again are one of the most common causes of allergies. Mattress cover creates a barrier over the mattress and prevents moisture or dust from attacking it. So your mattress stays fresh and new looking for a long time.