... new ones, plus it will help prevent new infestations.For protection, place the mattress pad between the box spring and ... .100% cotton.Twin under mattress pad measures 37" W x 74" L,Twin Extra Long measures 37" W ... x 79",Full measures 53" W x 74" L,Queen is 59" W x 79" L, King is ... 75" W x 79" L and California King measures 71" W x 83" L.Protection lasts for up to 20 ...