● LOW COST LUXRY ULTRASONIC QUILT WATERPROOF MATTRESS ENCASEMENT ● Top is 100% polyester microfiber brushed with hollow fiber filling and then laminate waterproof and breathable TPU layer ● Other five sides are 100% polypropylene 70-80g/m2 ● 3# strong zipper sewing on one wide side and extend 100cm of each long with ● At bottom of zipper with velcro protect , so that the bed bug can not enter into the mattress.