I have used these insulated pads for years without problem or incident. They are comfy, warm, tough, light and easy to use. If you have a Big Agnes bag, they are also designed to be the insulation on the bottom of the sleeping bag. Note: the Air Core pad is designed for +35F and above, the INSULATED Air Core is designed for +15F and above. If you need a bag to go below +35F you need to get this insulated pad. I use an INSULATED pad with a +40F BA Yampa down bag and weather low 30s nights (frost and ice on the tent, low 30s predicted for the town in the valley below) with no problems using a merino base layer shirt, hiking pants, wool socks, and a Dome Perignon hat (the Yampa doesn't have a hood). I do tend to be a warm sleeper, but camp mates have fared as well with the BA system. If you have a bag rated for anything below 40 or are a cold sleeper, get an insulated pad.