This is a Pica Corporation greenhouse-specific option, an insulation cover. I purchased it a long time ago along with a glass greenhouse and have kept it indoors, unused and unopened. I opened it to take photos. I don't think there is any deterioration, but please refrain from purchasing if you are concerned about minor details, as it has been stored by an individual. I will ship the contents and instruction manual only, without the box. If you prefer the box, please comment. Shipping costs will be added. I am a non-smoker. I have pets.