NEMO Equipment Sonic Down Mummy Sleeping Bag

The NEMO Sonic is a down mummy sleeping bag built for extreme cold, available in 0°F and -20°F temperature ratings and in Short, Regular, and Long lengths. The shell and liner are 100% recycled, bluesign-approved fabrics. Fill is 800-fill-power hydrophobic down that is PFAS-free and certified to the Responsible Down Standard (RDS), which requires verified animal welfare practices throughout the supply chain. Chevron baffle construction compartmentalizes the down to prevent migration and maintain even loft across the bag.

Features

• Thermo Gill vents: Integrated multistage zipper system extends the usable temperature range and allows fine-tuned comfort adjustment from inside the bag.
• Chevron baffles: Baffle geometry compartmentalizes down to prevent migration and keep fill evenly lofted throughout the bag.
• Toester waterproof footbox: Waterproof and breathable footbox uses a layer of synthetic insulation to protect down from moisture, resist tent-wall condensation, and retain warmth at the toes.
• Stretch knee panels: Stretch construction at the knees accommodates side sleeping without restricting movement.
• Offset zipper: Zipper placement creates a thermally efficient seal and an updated profile that secures warmth closer to the body.
• Redesigned draft collar and tubes: Bolstered draft collar and draft tubes block cold air infiltration at the neck and zipper.

Specifications

• Temperature ratings: 0°F and -20°F
• Fill: 800-fill-power hydrophobic down, PFAS-free, RDS-certified
• Shell and liner: 100% recycled fabrics, bluesign-approved
• Footbox insulation: Synthetic (waterproof/breathable layer)
• Available lengths: Short, Regular, Long (not all lengths available in all temperature ratings)