Name: Sonic Down Mummy Sleeping Bag
SKU: 871899

Built to be the only bag you need from 0F to 40F, weve updated our Backpacker Editors Choice award-winning big-mountain bag, Sonic, for even greater warmth, tuneability, and reduced environmental impact. With this bag, we are launching our next generation Thermo-Gills with a new multi-stage zipper system that dramatically increases the usable temperature range of the bag and allows fine-tuning of comfort from within the bag. Sonics new chevron baffle construction better compartmentalizes down, eliminating migration and keeping the down evenly lofted. Not to mention, it looks awesome. In updating the Sonic design, we put a high priority on taking a leap forward in sustainability. The shell and liner fabrics of Sonic are 100% Global Recycled Standard (GRS) recycled and bluesign approved. The premium 800FP hydrophobic down is 100% Responsible Down Standard (RDS) certified. We also took years of history in the field to make detailed upgrades including massaging the profile of the bag, redesigning the draft collar, and bolstering the draft tubes. Our proven Toester footbox keeps feet warmer, provides a waterproof barrier against tent wall condensation, and protects down from moisture while drying damp clothes inside the footbox. Adaptable to whatever the mountain throws at it, Sonic continues to reverberate as the ultimate extreme weather companion.

Award-winning designis updated for even greater warmth retention and adjustability across temperatures.
Updated design incorporates 100% Global Recycled Standard (GRS) recycled, bluesign approved shell and liner fabrics.
UpdatedThermo Gillsextend the comfort range with a new multi-stage zipper system.
Overstuffed withpremium 800FP hydrophobic downthat is PFC-Free and 100%Responsible Down Standard (RDS) certifiedensuring humane treatment and traceability throughout the supply chain.
New chevron baffle construction better compartmentalizes down for more uniform loft and down migration prevention.

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