One size fits all with this Pen+Gear Universal Mattress Bag that measures 78?? x 14?? x 100??. This mattress bag will fit mattresses and box springs from twin to king . and will protect your items from dirt . dust . light exposure . moisture . or debris when moving or storing. To prepare for your move . slide the clear . plastic bag over your mattress or box spring. Seal the ends with a few pieces of tape (sold separately) to prevent the mattress from slipping out of the cover during transportation. Alternatively . this cover can also be used to protect your mattress or box spring from tears . damage . paint or dust during home renovation. Keep your mattress safe from the elements during any aspect of your move or home renovation.