Protect your mattress or box spring from bed bug infestations. Mattress and box spring encasements are a good start to pest control. For a new mattress and box spring, it"s important to protect your mattress from the time it is unwrapped upon delivery to your home. By sealing the mattress and box spring in Comfort Mark mattress encasements, you will prevent bedbugs from making a home in your new bed. For existing mattresses, Guardsman"s ComfortMark Mattress or Box Spring Encasement traps pests inside. Because they are deprived of their food source, they die off over time. New pests are prevented from entering your mattress too. For best results, do not remove the encasement for 12 months to ensure pests do not escape. Fits up to 13" depth.