okay just finish my winter cat shelter I did this year use a Rubbermaid five foot deck box we did a six inch hole on that end and a six inch hole on the other end for entrance and escape I did a six inch window so they can see who's coming towards them okay once inside we have our two inches of hay we have two inches of foam and this is a radiant barrier that goes all around radiates the heat back to their body I certainly will be putting in heating pan and a little cat house once I close the lid and lock it all up they're good for the whole entire winter