bicycleagent003 wrote an answer about Marmot Pinnacle Sleeping Bag: 15 Degree Down on January 4, 2011
It is incorrect to say the bags are equally warm because they have the same temp rating. The previous reviewer is correct: "The warmth is NOT identical. The pinnacle is EN rated down to 10°F, while the Helium is EN rated to 16°F." Check the Marmot site for this info.