How does SL 90 synthetic in this bag differ from the Hotstream recycled synthetic insulation which I think their later model has? — 1 Answer

"The SL90 synthetic insulation offers excellent warmth due to its approximately 20% higher loft than similar fills as well as a soft feel and great compressibility." The new Hotstream has a more "drape" style of insulation and construction as you have probably ready about. "In the majority of its synthetic fill sleeping bags, Big Agnes will use Insotect Hotstream, a new performance, all-purpose thermal poly insulation built for outdoor products. It has a low carbon foot-print and is made with 100% recycled fiber, while remaining extremely durable. Insotect Hotstream replaces a recycled content fill previously used by the company." So the main difference I would say is the carbon footprint and recycling component. Let us know if you have any additional questions.