Don't waste money on this product it is too small for grownup cats.   When you purchase the insulation layer the grownup cat will no longer use the Katcabin because of the size, that small amount extra inches in girth is simply too much.   If you don't purchase the insulation roll you don't have any kind of winter protection.   It plastic and thin.   My feelings this is ripe off for the price of 100.00.