AllerEase Ultimate Zippered Pillow Protector delivers premium comfort and protection for a truly clean bed. It features soft, 100% cotton fabric with temperature-balancing properties to wick moisture when you're hot and insulate when you're cold. Our expertly designed Allergy Defense Fabric® even prevents unhealthy household allergens -- like dust mites, pollen, and pet dander -- from collecting in your pillow. Antimicrobial product protection keeps your protector fresh by inhibiting the growth of odor-causing bacteria, and it can be washed in hot water to remove dirt, bacteria, and surface allergens. Ultimate Cotton covers your pillow completely and zips closed to keep it protected for a healthy night's sleep. It is backed by the AllerEase Lifetime Warranty.