The NEMO Tango Solo works with 20" x 72" or 25" x 76" pads, but is simply magical with a Cosmo insulated Lite or Astro Insulated Lite pads combined with the appropriate Slipcover. Its backless design keeps it under the weight of a typical bag, making it the lightest roomiest bag to bring from trailhead to summit.Features:700 Fill Power Downtek DownTemperature Rating: 30F / -1CBrings the most home-like sleep systemBlanket Fold provides "Tucked-in Comfort"Waterproof / Breathable FootboxBackless DesignInsotect FlowGates prevent downward movement of insulationVideo -NEMO Sleeping Bags Design