This is one of the warmest pads you will find with a R value of 5. It inflates to 2.5" to get you off the cold ground and keep you warm. It is a little heavier at almost 2 1/2 pounds but a good warm sleep is worth it. This is especially true with Big Agnes bags that do not have insulation in the bottom. I leave this pad in my Lost Ranger bag and roll them up together. The only downside is it takes about 5 minutes to inflate this portable bed.