This mattress protector features a zipper closure for a secure fit that completely covers your sleep surface. Its breathable polyester fabric allows for airflow while providing a barrier against allergens and liquids. It is designed to be water-resistant and stain-resistant, helping to maintain the condition of your mattress. The hypoallergenic material is also treated to be antimicrobial and resistant to dust mites and bed bugs. We also love that the machine washable components make it easy to keep your bedding fresh and clean.