360 DEGREES OF PROTECTION: These encasements help to provide 360 degrees of protection, enclosing around the mattress completely Zips and seals tightly shut Set includes 4 encasements ensure you always have one on hand. ADVANCED PROTECTION FOR SAFER AND HEALTHY SLEEP: The encasement creates a barrier for advanced protection from environmental allergens and asthma instigators.BLOCKS WETNESS: 100% waterproof construction protects mattress from leaks, spills, stains and odors.EASY TO CLEAN: Machine wash warm, tumble dry lowDIMENSIONS: 52L x 28 x W (per encasment)