{"product_id":"sac-de-couchage-grand-froid-naturehike-base1100","title":"Extreme cold sleeping bag -16°C | Naturehike BASE1100","description":"\u003ch2\u003eTechnical specifications\u003c\/h2\u003e\n\u003cul\u003e\n\n\u003cli\u003e\n\n\u003cstrong\u003eDimensions (M):\u003c\/strong\u003e 200×85 cm — recommended height under 175 cm\u003c\/li\u003e\n\n\u003cli\u003e\n\n\u003cstrong\u003eDimensions (L):\u003c\/strong\u003e 210×90 cm — recommended height over 175 cm\u003c\/li\u003e\n\n\u003cli\u003e\n\n\u003cstrong\u003eComfort temperature:\u003c\/strong\u003e -16°C\u003c\/li\u003e\n\n\u003cli\u003e\n\n\u003cstrong\u003eLimit temperature:\u003c\/strong\u003e -25°C\u003c\/li\u003e\n\n\u003cli\u003e\n\n\u003cstrong\u003eExtreme temperature:\u003c\/strong\u003e -50°C\u003c\/li\u003e\n\n\u003cli\u003e\n\n\u003cstrong\u003eWeight:\u003c\/strong\u003e 1530g (M) \u0026amp; 1620g (L)\u003c\/li\u003e\n\n\u003cli\u003e\n\n\u003cstrong\u003eFill:\u003c\/strong\u003e 650FP water-repellent duck down — 90% down clusters \/ cleanliness 1000 mm\u003c\/li\u003e\n\n\u003cli\u003e\n\n\u003cstrong\u003eDown certification:\u003c\/strong\u003e Responsible Down Standard (RDS)\u003c\/li\u003e\n\n\u003cli\u003e\n\n\u003cstrong\u003eOuter fabric:\u003c\/strong\u003e 20D waterproof, breathable, ripstop nylon\u003c\/li\u003e\n\n\u003cli\u003e\n\n\u003cstrong\u003eThermal standard:\u003c\/strong\u003e GB\/T 38426-2019 and ISO 23537-1\u003c\/li\u003e\n\n\n\u003c\/ul\u003e\n\u003ch2\u003eThermal certification GB\/T 38426 and ISO 23537: interpreting values and validity conditions\u003c\/h2\u003e\n\u003cp\u003eThe BASE1100 certifies a comfort temperature of \u003cb\u003e-16°C\u003c\/b\u003e and a limit temperature of \u003cb\u003e-25°C\u003c\/b\u003e according to \u003cb\u003eGB\/T 38426-2019\u003c\/b\u003e and \u003cb\u003eISO 23537-1\u003c\/b\u003e standards, which are measurement protocols using thermal mannequins in standardized conditions. These two standards coexist with identical test protocols: the values are directly comparable between models certified under either reference. The extreme temperature of \u003cb\u003e-50°C\u003c\/b\u003e corresponds to the theoretical survival threshold defined by the standard, applicable only in emergency situations with full equipment. In field conditions at this range, a sleeping pad with an \u003cb\u003eR-value greater than 5\u003c\/b\u003e, a merino base layer, and airtight wind protection are non-negotiable prerequisites.\u003c\/p\u003e\n\u003ch3\u003e650FP water-repellent duck down: 1000 mm cleanliness and RDS certification\u003c\/h3\u003e\n\u003cp\u003eThe filling is \u003cb\u003e650FP\u003c\/b\u003e water-repellent \u003cstrong\u003educk down\u003c\/strong\u003e, with a \u003cb\u003e90%\u003c\/b\u003e down cluster ratio and a cleanliness rating of \u003cb\u003e1000 mm\u003c\/b\u003e certified by a third-party laboratory. The 650FP fill power positions this model below the 750-800FP of ultralight bags: compressed volume and weight are higher for an equivalent thermal fill, offset by a lower production cost and increased moisture resistance thanks to the water-repellent treatment applied directly to the down. The \u003cb\u003eResponsible Down Standard (RDS)\u003c\/b\u003e certification ensures the traceability of the down supply chain, from breeding to processing.\u003c\/p\u003e\n\u003ch3\u003eVertical box construction and 14-stitch\/3 cm down-proof thread: anti-migration and anti-leak\u003c\/h3\u003e\n\u003cp\u003eThe construction uses a \u003cb\u003evertical box structure\u003c\/b\u003e with independent compartments and high-density down-proof thread at \u003cb\u003e14 stitches per 3 cm\u003c\/b\u003e. The vertical box keeps the fill in position without nighttime migration, whereas box-stitch construction creates cold spots at every seam line. Three design points limit heat loss in critical areas: a full-length anti-draft baffle along the zipper, a mummy hood with independent drawstrings, and an \u003cb\u003eenveloping foot box\u003c\/b\u003e insulated in three dimensions.\u003c\/p\u003e","brand":"Duvet Nomade","offers":[{"title":"Blue \/ L \/ 1100","offer_id":53842459984209,"sku":"14:200003699#Base Blue 1100 L;200007763:201336100","price":489.0,"currency_code":"EUR","in_stock":true},{"title":"Blue \/ M \/ 1100","offer_id":53842460180817,"sku":"14:200005536#Base Blue 1100 M;200007763:201336100","price":469.0,"currency_code":"EUR","in_stock":true},{"title":"Grey \/ L \/ 1100","offer_id":53842460148049,"sku":"14:100018786#Base Grey 1100 L;200007763:201336100","price":489.0,"currency_code":"EUR","in_stock":true},{"title":"Grey \/ M \/ 1100","offer_id":53842460213585,"sku":"14:365016#Base Grey 1100 M;200007763:201336100","price":469.0,"currency_code":"EUR","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0993\/9173\/4097\/files\/naturehike_base1100_bleu.webp?v=1779491876","url":"https:\/\/duvet-nomade.com\/en\/products\/sac-de-couchage-grand-froid-naturehike-base1100","provider":"Duvet Nomade","version":"1.0","type":"link"}