NEMO Sonic Sleeping Bag

Engineered for serious backcountry performance, this premium sleeping bag delivers exceptional warmth, comfort, and sustainability in cold-weather conditions. Designed for mountaineering and demanding outdoor use, it combines advanced insulation technology with eco-conscious materials to ensure reliable thermal efficiency without compromising on environmental responsibility.

Key Features & Specifications:

• Chevron baffle construction keeps down evenly distributed, preventing migration and maintaining consistent loft for optimal warmth
• 800-fill-power hydrophobic down, RDS-certified and PFC-free, provides high-performance insulation with excellent moisture resistance
• Shell and liner fabrics made from 100% recycled materials and certified to the Global Recycled Standard (GRS), with bluesign® approval for sustainable production
• Redesigned draft collar and draft tubes minimize heat loss by blocking cold air infiltration
• Offset main zipper creates an improved thermal seal for enhanced heat retention
• Thermo Gills™ multi-stage ventilation system allows controlled airflow to regulate temperature on milder nights
• Stretch knee construction improves comfort and mobility, especially for side sleepers
• Waterproof/breathable Toester™ footbox with synthetic insulation protects against condensation and keeps feet warm and dry

Technical Specifications:

• Temperature rating: 0°F (-18°C)
• Tested comfort: 14°F | Tested lower limit: 0°F (ISO 23537)
• Insulation: 800-fill-power down
• Shell: Recycled nylon | Lining: Recycled polyester
• Shape: Mummy design for thermal efficiency
• Weight: 3 lbs 2 oz to 3 lbs 9 oz (size dependent)
• Fits up to 66″–78″ with varying girth measurements by size
• Left-side zipper configuration
• Compression volume: 8.9–9.9 liters depending on size