I needed a replacement house for the feral black, senior cat that lives on my porch in the frigid WI winter. Last few years, he made due with a padded dog cube that I cut a hole in for a heating pad and placed a synthetic blanket inside (never use cotton - they never dry and your cat will get hypothermia) - but it wasn’t waterproof and it was too small for him to be truly comfy. When I saw this large, highly elevated, heated house I had to order it. It got here in a few days and I assembled it in under 10 min. Review the product photos to see how well insulated this sucker is - for those trashing the inner reflective Mylar, read up on heat conductivity and Mylar emergency blankets and get back to us. Anyway, it’s well made, waterproof, designed to heat but not overheat - if you’ve ever fallen asleep with a heating pad you’ll know it can get crazy hot - you don’t want that for a cat who will sleep hours in this thing. I wanted the laying surface inside to be more comfy for my older feral so I got a 3” thick dog crate and it fit perfectly! I also stuck a low-light, usb motion light at the entrance that turns off after they get comfy. It’s seriously the best, warmest cat house I’ve ever purchased and I’ve now gotten a second one (the elevated vs highly elevated since there’s isn’t snow and rain to contend with) for the friendly kitty who lives in my garage. The only thing that could’ve made this better - was a second escape entrance on the back side, but I’m not sure if it would be as strong and secure if it had that. Advice - buy the largest one you can so they can stretch out and be truly comfortable. If you’re placing this outside, get the highly elevated so that it’s up off the wet, cold ground. (For the comfy inner mattress, see the one made by EMPSIGN “Stylish Dog Bed” and select the one that will fit your cat house by reviewing the inner dimensions. They’re waterproof, have a removable/washable plush cover and will be used separately in the non-winter months for the cats to lay up.) These cats love their new homes and it’s my way of paying them back for the excellent mousing they do for me year-round next to cornfields.