Long praised as the only bag you need from -20° to 40° Fahrenheit, Sonic™ gets updated for even greater warmth retention and tuneability-while incorporating 100% recycled, bluesign® certified materials for sustainability and stewardship. Updated Thermo Gills™, Toester™ footbox, and over-stuffed with 100% 800FP RDS certified, hydrophobic down, Sonic™ is fine-tuned for frigid weather and environmentally conscious adventure.

Features
• New Thermo Gills™: Updated design with a multi-stage zipper system allows for an even wider temperature range and fine tuned heat regulation
• Chevron Baffles: New chevron baffle construction better compartmentalizes down for more uniform loft and to eliminate insulation migration
• Toester™ Footbox: Keeps your feet warmer, protects against tent wall condensation, and protects down from moisture while drying damp clothes in the footbox
• Chogori™ Mountaineering Tent
• Tensor™ Alpine Insulated Sleeping Pad

Materials
• Fill: 800FP hydrophobic PFC-Free 100% RDS certified down
• Shell: 20D 100% Recycled Nylon, bluesign® Certified Ripstop w/DWR
• Lining: 20D 100% PCR Polyester, bluesign® Certified Taffeta w/DWR
• Footbox: 40D 100% Recycled Nylon, bluesign® certified ripstop W/B w/DWR

Specifications
• Best Use: Winter Camping/Mountaineering
• Temp: -20°F/-29°C
• Weight: 3lb, 14oz/1.76kg
• Packed Size: 14.5x10.5in dia/37x27cm dia