Ionosphere 5.5Crafted for extreme temperatures and hostile environments, the Ionosphere 5. 5 is fully equipped with the tech to insulate you from the freeze. Its design reduces heat loss through both radiation and convection, thanks to the heat reflective TILT technology and air trapping Stratus R insulation. With a superior warmth to weight ratio and small pack size, its the perfect high comfort sleep mat for alpinists and mountaineers who need to hunker down in