Luna Premium Hypoallergenic Zippered Bed Bug Proof Mattress Encasement 9" Height - Twin XL Size - Made In The USA Completely encases the entire mattress with a zippered waterproof membrane and dust mite barrier for total protection Protects against bed bugs, dust mites, bacteria and liquid spills Luna Airflow Technology allows air to circulate through, but repels water Hypoallergenic cotton terry cover naturally absorbs moisture 3-Sided Bed Bug Proof Zipper