The Comfort Plus Insulated Sleeping Mat offers a great combination of its Air Sprung Cell technology and dual layer comfort. With two separate layers of interlocking air chambers and our multi-function valve, the sleeper can fine-tune the top layer to perfection, and adjust the base layer to accommodate for rough terrain. The built-in redundancy is not to be taken lightly - if one side of the mat punctures, the other is still able to function until a repair is made. It's insulated with Thermolite and Exkin Platinum for great warmth.