I purchased two Lucid Encasements for my new twin XL mattresses with a height of 14”. The encasements fit perfectly because they accommodate mattresses of heights up to 16”. They were easy to put the mattress into by me without the need for help from someone else. I washed them before use with a 30 minutes quick wash cycle and dried them on medium-low dryer setting with the timer on 60 minutes to avoid higher temps. They came out dry and excellent without any damage. Before finding the Lucid Encasements I looked at so many but had to eliminate them because they did not meet my requirements and those that did were not made for the 14” mattress height. I am giving the Lucid Encasement 5 stars because it was the solution on all levels to my problem.