http://www.snugglesafe.ca/index.htm I use these for our 2 outside half wild 'barn' cats when it's cold, & got the idea to pop a couple into the coop with the 8 weeks olds--I wrap it in newspaper. Works great! We don't have electricity out there & it's too far from the house to run cords for a heat lamp. It was 30 degrees here this morning but all chicks were warm & happy. Found these several years ago at the PetSmart store here--above link is just to provide info if anyone is interested.