Bugstop Advantages *Bugstop encasement's have a special tight zipper and patch and inner lining that don't allow bed bugs and their eggs in or out even if the zipper is not 100% zipped. This means that bugs cannot escape, not even if the zipper slips open. *Internal Protective Flap * Smooth Silk Feel Fabric, Our fabric is smooth, soft and comfortable and very soft! No seams, pockets, or folds. Bed bugs can hide and lay eggs in seams, pockets, and folds.Not with Bugstop,our encasement's have no seams, pockets, or folds, leaving bed bugs no place to hide. * Bugstop Armour Membrane Our encasement's are bed bug bite-proof and escape-proof because the inside of the entire encasement are coated with special Membrane- all sides! The Membrane is a polyurethane-based product that is bed bug escape-proof and bed bug bite-proof water proof and allergy proof. Some other products only use a membrane on the top side of the encasement, if they even use it all all! * Zipper and Patch Design Our encasement's have tiny zipper teeth . This prevents bed bugs and bed bug eggs from slipping through the teeth.Our Bugstop patch at both ends will not allow bed bugs and their eggs in or out even if it is open a bit. *100 % Protection at the best price. Bugstop is Dust mite proof, Bed Bug proof, Waterproof & Air Vapor Porous. Please choose either from our full bed Bundle packages[1 Bugstop mattress cover,1 SMS box spring cover and 2 pillow encasement's,] or if you don't have a box spring please select your mattress size and depth from Mattress Covers Alone