Offer an advanced level of protection with Sertas 4-Pack of Sertapedic Crib Mattress Zippered Encasements. The solution for a safer and healthier sleep space, these covers are laboratory tested to maintain the hygiene and safety of your babys crib mattress. A zipper seals tightly shut, creating a barrier against environmental allergens and helps provide 360-degrees of protection. The 100% waterproof construction protects the mattress from leaks, spills, stains and odors. Easy to clean and maintain, the encasement is machine washable. Rest easy knowing your little one can sleep safe and sound, fully protected from environmental allergens and unwanted insect invaders, with these Sertapedic Crib Mattress Zippered Encasements.