SPARK™ ULTRALIGHT SLEEPING BAG

The Spark™ Ultralight Sleeping Bag Series spans everything from an ultralight down-filled liner to a mid-winter fast-and-light sleeping bag. Each model uses premium materials and no-frills design to provide cutting-edge performance for the designed end-use. Ultralight does not mean ultra-tight: The Spark sleeping bags are snug but still have adequate girth for the performance-oriented backcountry user. IS THIS DOWN SLEEPING BAG…? Suitable for cooler temperatures? Yes. You would want the Spark 5°F or possibly the 18°F – either bag will work in late Fall, the 5°F will take you down to winter temperatures when paired with an adequately insulating sleeping mat like the Comfort Light Insulated. Really suitable as a sleeping bag liner? Yes. You could use the Spark 50°F, or even the Spark 40°F or 28°F to boost the performance of a bag for cold-weather use. Adding one of these to a 20°F / -5°C bag might make more sense than buying a “0°F / -20°C” bag for only occasional winter use. Able to be zipped to another sleeping bag? No. Even though the 18°F or 5°F have full-length side zippers, they are not designed to be coupled to a sleeping bag with a right zipper (for instance the Flame 18°F or 5°F). Read up on the factors which define and affect down quality, and what they mean for you as an end user HERE  HIGHLIGHTS Best Use Ultralight Backpacking, Bike Touring, Liner Bag Performance Summer or Sleeping Bag Liner: 50°F  (comfort range 50°F to 70°F) Warm weather: 40°F (comfort range 40° to 60°F) 2 Season: 28°F (comfort range 28°F to 60°F) 2.5 Season: 18°F (comfort range 18°F to 55°F) 3.5 Season: 5°F (comfort range 5°F to 50°F) FEATURES ULTRA-DRY Down 850+ Loft 90% Down Cluster Premium Goose Down certified Responsible Down Standard(RDS) 10D shell and 7D liner materials help to achieve the incredible lightweight and compact packed size Includes lightweight Ultra-Sil™ compression bag and storage cell Zipper-length trimmed for gram-saving performance 50°F, 40°F, and 28°F have 1/3-length zippers 18°F and 5°F have full-length side zippers Baffle construction 50°F and 40°F have sewn-through construction. 28°F has baffles in the torso and sewn through in the leg area. 18°F and 5°F are fully baffled.