Perfect product for little piggies
I brought 2 of these for my guinea pigs to keep them lovely and warm during the cold weather. They are very hard and seem like they wouldn't be very comfy, but having said that, 1 of my piggies sleeps on top of it. I couldn't believe that they stayed hot for 10 hours, but they really do. A great product, money well spent and 5 very happy piggies.