Nemo Sonic Down Sleeping Bag -20F/-29C When winter camping in Canada's backcountry demands a sleeping bag that performs at genuine cold-weather extremes, the NEMO Sonic -20F/-29C is the kind of investment that earns its keep every time the temperature drops hard. The Sonic is built around 800-fill-power hydrophobic down, certified to the Responsible Down Standard for humane treatment and full supply chain traceability. Overstuffing the baffles ensures loft is maintained even after compression, and the hydrophobic treatment keeps the down performing in the damp conditions that are unavoidable on Canadian winter expeditions. The redesigned draft collar and draft tubes create a secure seal at the neck and zipper that blocks cold air from finding its way in, while the updated profile pulls the bag closer to the body for improved thermal efficiency throughout. Thermo Gill vents at the core let you release body heat during high-output moments without exposing yourself to the cold, a genuinely useful feature in variable mountain or winter camping conditions. The Toester footbox is tailored for foot comfort with a waterproof and breathable construction, plus an added layer of synthetic insulation specifically to address the cold spots that plague standard down footboxes. Stretch construction at the knees accommodates side sleepers, and an offset zipper creates a thermally efficient seal along the full length of the bag. For basecamp mountaineering, winter canoe tripping, or any cold-weather adventure across Canada, the Sonic delivers. Backed by NEMO's Lifetime Warranty. Temperature rating: -20F / -29C Fill: 800-fill-power hydrophobic RDS certified down Fill weight: 2 lb 2 oz / 960g Minimum weight: 3 lb 8 oz / 1.59 kg Packed size: 16.0 x 8.5 in diameter / 41 x 22 cm Fits up to: 6 ft / 183 cm Footbox: Toester waterproof/breathable with synthetic insulation layer Venting: Thermo Gill adjustable vents Includes: Compression stuff sack, mesh storage bag Warranty: NEMO Lifetime Warranty WHAT'S INCLUDED Compression stuff sack Mesh storage bag Specs & Sizing Capacity 1 Minimum Weight 3 lb , 8 oz / 1.59 kg Packed Size 16.0 x 8.5 in dia / 41 x 22 cm dia Temp Rating -20F / -29C Fill Type Down Fill Weight 2 lb , 2 oz / 960 g Fits Up To 6' / 183 cm Shoulder Girth 61 in / 155 cm Hip Girth 58 in / 147 cm Knee Girth 53 in / 135 cm Compressed Volume 11.96
