A HealthGuard™ Full Encasement Bed Bug Barrier is your mattresses best defense against infestation. HealthGuard™ Mattress Encasement products provide relief from worry about infestations. When you encase your mattress and box spring, any pests inside are trapped and 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 that pests do not escape.