{"product_id":"nemo-sonic-sleeping-bag-20f-29-c","title":"Nemo Sonic Sleeping Bag -20F\/-29°C","description":"\u003cp\u003eComfort doesn't have to be sacrificed for performance, and the Sonic certainly delivers on both. The Nemo Sonic is a high-performance ultralight mummy sleeping bag designed for mountaineers, winter expeditions, and alpine climbers who demand the most reliable warmth in the most extreme conditions. Built to handle everything from deep winter bivvies to high-altitude expeditions, it combines premium insulation, advanced temperature control, and rugged construction into one highly adaptable sleep system. \u003c\/p\u003e\n\u003cp\u003eEngineered as a true big-mountain sleeping bag, the Sonic is designed to perform across a huge temperature range, from mild conditions down to serious sub-zero expeditions. Its award-winning design delivers exceptional warmth and protection in harsh alpine environments.\u003c\/p\u003e\n\u003cp\u003eOne of the Sonic’s standout features is its second-generation Thermo Gill™ vents, allowing you to fine-tune temperature without exposing yourself to cold drafts. Multi-stage zip system expands the usable temperature range. Vent excess heat during milder conditions and retains warmth when temperatures drop. This makes the Sonic incredibly versatile, effectively replacing multiple sleeping bags with one adaptable system.\u003c\/p\u003e\n\u003cp\u003eFilled with 800 fill power hydrophobic down, the Sonic delivers outstanding warmth-to-weight performance: High loft for efficient heat retention. Moisture-resistant treatment for damp mountain conditions. RDS-certified for responsible sourcing paired with chevron baffle construction, the insulation stays evenly distributed, eliminating cold spots and preventing down migration.\u003c\/p\u003e\n\u003cp\u003eBuilt for real-world winter expedition conditons, every detail is designed for durability and performance.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003e\u003ciframe width=\"560\" height=\"315\" src=\"https:\/\/www.youtube.com\/embed\/3YkNtgsdMA8?si=UP8y1Mmicfb5dB79\" title=\"YouTube video player\"\u003e\u003c\/iframe\u003e\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eMore Help?\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003eFor further assistance on choosing your down sleeping bag, we have an article explaining fill power, the pros and cons of down over synthetic insulation and more info on caring for your bag available to view \u003cspan\u003ehere: \u003c\/span\u003e\u003ca href=\"https:\/\/rockrun.com\/blogs\/the-flash-rock-run-blog\/a-guide-to-down-sleeping-bags-buying-guide\" title=\"Article: A guide to down sleeping bags...down explained\"\u003eA Guide to Down Sleeping Bags\u003c\/a\u003e\u003cspan\u003e.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eFeatures\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eAward-winning design updated for even greater warmth retention and adjustability across temperatures.\u003cbr\u003e\n\u003c\/li\u003e\n\u003cli\u003eSecond-generation Thermo Gill™ vents extend the comfort range with a new multistage zipper system.\u003cbr\u003e\n\u003c\/li\u003e\n\u003cli\u003eChevron baffle construction better compartmentalises down for more uniform loft and down migration prevention.\u003cbr\u003e\n\u003c\/li\u003e\n\u003cli\u003eToester™ waterproof\/breathable footbox utilises a layer of synthetic insulation to protect the down and deliver maximum toastiness for toes.\u003cbr\u003e\n\u003c\/li\u003e\n\u003cli\u003eConstructed with bluesign® approved 100% recycled shell and liner fabrics.\u003cbr\u003e\n\u003c\/li\u003e\n\u003cli\u003eFilled with premium 800 FP hydrophobic, PFAS-free, RDS-certified down. Products certified to the Responsible Down Standard (RDS) contain down or feathers from farms certified to animal welfare requirements.\u003cbr\u003e\n\u003c\/li\u003e\n\u003cli\u003eStretch construction at the knees for comfortable side sleeping.\u003cbr\u003e\n\u003c\/li\u003e\n\u003cli\u003eOffset zipper creates a thermally efficient seal while an updated profile secures warmth closer to the body.\u003cbr\u003e\n\u003c\/li\u003e\n\u003cli\u003eWhat's included: Compression Sack, Mesh Storage Cube.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cul\u003e\u003c\/ul\u003e\n\u003cp\u003e\u003cstrong\u003eSpecification\u003c\/strong\u003e \u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eIntended use: Winter backpacking, camping and Alpine mountaineering\u003c\/li\u003e\n\u003cli\u003eSeason Rating:  4 season.\u003c\/li\u003e\n\u003cli\u003eSleeping bag Weight: Regular: 1.76kg \/ Long: 1.9kg\u003c\/li\u003e\n\u003cli\u003eMaximum User Height: \u003cmeta charset=\"utf-8\"\u003eRegular: 183cm \/ Long: 198cm\u003cbr\u003e\n\u003c\/li\u003e\n\u003cli\u003eComfort Temp Limit: -29°C\u003cmeta charset=\"utf-8\"\u003e\n\u003c\/li\u003e\n\u003cli\u003eDown treatment: Hydrophobic, PFC-Free Down\u003cbr\u003e\n\u003c\/li\u003e\n\u003cli\u003eMax Shoulder Circumference: Regular: 160cm \/ Long: 165cm\u003cmeta charset=\"utf-8\"\u003e\n\u003c\/li\u003e\n\u003cli\u003eShell Fabric: 20D 100% Recycled Nylon, Bluesign Certified Ripstop w\/ DWR\u003c\/li\u003e\n\u003cli\u003eLining: 20D 100% Recycled Polyester, Bluesign Approved Taffeta w\/ DWR\u003c\/li\u003e\n\u003cli\u003eFootbox \u003cbr\u003e\n\u003c\/li\u003e\n\u003cli\u003eFill power: 800 FP Down\u003cbr\u003e\n\u003c\/li\u003e\n\u003cli\u003eFill Weight: Regular: 1.06kg \/ Long: 1.12kg\u003c\/li\u003e\n\u003cli\u003eCompression Size: Regular: 37 x 27 cm \/ Long:  39 x 27 cm\u003cbr\u003e\n\u003c\/li\u003e\n\u003cli\u003eZip Configuration: Left\u003c\/li\u003e\n\u003cli\u003eColour: Goodnight Goodnight Gray \/ Torch\u003cbr\u003e\n\u003c\/li\u003e\n\u003cli\u003eCut: Mummy\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cul\u003e\u003c\/ul\u003e","brand":"Nemo","offers":[{"title":"Regular","offer_id":57116903473525,"sku":"SS-DB-NSSB0F\/-29C-REGULAR","price":594.0,"currency_code":"GBP","in_stock":true},{"title":"Long","offer_id":57116903506293,"sku":"SS-DB-NSSB0F\/-29C-LONG","price":630.0,"currency_code":"GBP","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/1554\/2851\/files\/1_e75fc533-ee98-4275-800b-c82ecadea33a.png?v=1777543127","url":"https:\/\/rockrun.com\/no\/products\/nemo-sonic-sleeping-bag-20f-29-c","provider":"Rock+Run","version":"1.0","type":"link"}