Thermarest proton camping blanket description a security blanket for high adventure the proton tm blanket is our most technical and versatile blanket offering the latitude to go from an adventurous fair weather bivy blanket to a deluxe campfire companion the proton will keep you charged for adventure knowing youll be warm and protected with its waterproof breathable shell eraloft tm synthetic insulation and reflective thermacapture tm technology designed to provide you with reliab