Hello sir. The box has 3/4 inch foam between outer and inner walls doors ceilings and floor. It is like a big cooler. Doors are vented as well as roof. Shading is necessary at times. Desert southwest generally has some wind so positioning vehicle is key. Ran in Sonoita Arizona last weekend. Was very nice weather. Just wished I had the ManCan! Will try to post photos of Jones box. Jones trailer out of Woodson Texas makes the best dog transport equipment I have found!