Nemo Sonic Down Mummy Sleeping Bag -20

The Nemo Sonic is engineered to be your go-to sleeping bag for temperatures between -29°C (-20°F) and 4°C (40°F.) This high-altitude sleeping bag, which has earned the Backpacker Editors’ Choice award, delivers outstanding warmth and versatility while minimizing environmental impact. It incorporates Nemo's advanced Thermo Gill vents with a new multi-stage zipper system, greatly extending the bag's temperature range and allowing for precise comfort adjustments from the inside. The Sonic’s chevron baffle design ensures the down stays evenly distributed, preventing clumping and maintaining loft, all while boasting a sleek appearance.

Both the shell and liner fabrics are made from 100% recycled materials and are bluesign approved, and the high-quality 800 FP hydrophobic down is fully Responsible Down Standard (RDS) certified. Drawing from years of field testing, this bag includes refined features such as an optimized profile, an improved draft collar, and enhanced draft tubes. The reliable Toester footbox keeps your feet warmer, acts as a waterproof barrier against tent wall condensation, and protects the down from moisture while also drying damp clothes placed inside. Ready to tackle any mountain conditions, the Sonic remains the premier choice for extreme weather adventures.

• Award-winning design with improved warmth retention and adjustability
• Made from 100% recycled, bluesign approved fabrics
• Thermo Gill vents with a new multistage zipper system
• Filled with 800 FP hydrophobic down, PFC-Free and RDS certified
• Chevron baffle construction prevents down migration and ensures uniform loft
• Stretch construction at the knees for comfortable side sleeping
• Toester waterproof footbox keeps toes warm
• Offset zipper and updated profile for efficient thermal seal
• Compression cack included
• DWR (Durable water repellent) treatment

Technical Features
Limit: -29°C (-20°F)
Zipper: Left

Weight

	Regular	Long
Packed Weight	1.85 kg	1.99 kg
Minimum Weight	1.76 kg	1.9 kg
Fill Weight	1.06 kg	1.12 kg

Dimensions

	Regular	Long
Packed Size	37 x 27 cm dia	39 x 27 cm dia
Fits Up To	183 cm	198 cm
Shoulder Girth	160 cm	165 cm
Hip Girth	147 cm	153 cm
Knee Girth	135 cm	140 cm
Compressed Volume	12.5 L	13.4 L

Materials
Insulation: Hydrofobic down, 800 FP
Shell: 100% recycled nylon, ripstop (20D)
Lining: 100% recycled polyester, taffeta (20D)
Footbox: 100% recycled nylon