I purchased this item ahead of winter weather. I have two outside fur babies I've been feeding for several months. I was blessed when a neighbor gave me a dog house she didn't need. Googled how to prepare winter a shelter. Suggested along with "straw" %26 styrofoam is mylar. I tapped this item (mylar) to walls on top of styrofoam. Lastly I through in "straw" on styrofoam on floor. Today dangerous winter storm hit, ice %26 snow. While I was out cleaning porch %26 steps, youngest fur baby came up just mewing. This his 1st winter. Went in house, fixed his food, put in microwave to heat. He followed me to house/shelter. Put food in house %26 coaxed him. He went right in %26 started eating. Sure hope he stays in there til tomorrow when I feed him again. This mylar will help keep him warm during freezing temperatures.