{"product_id":"sac-de-couchage-grand-froid-naturehike-ul1100","title":"Extreme cold sleeping bag -21.4°C | Naturehike UL1100","description":"\u003ch2\u003eTechnical specifications\u003c\/h2\u003e\n\u003cul\u003e\n\n\u003cli\u003e\n\n\u003cstrong\u003eWeight:\u003c\/strong\u003e 1.59 kg (M) \/ 1.68 kg (L)\u003c\/li\u003e\n\n\u003cli\u003e\n\n\u003cstrong\u003eDimensions:\u003c\/strong\u003e 85 x 200 cm (M) \/ 90 x 210 cm (L)\u003c\/li\u003e\n\n\u003cli\u003e\n\n\u003cstrong\u003eExtreme compression:\u003c\/strong\u003e 24 x 25 cm\u003c\/li\u003e\n\n\u003cli\u003e\n\n\u003cstrong\u003eFilling:\u003c\/strong\u003e 850 FP white goose down, 95% down, cleanliness 1000mm, \u003cstrong\u003eRDS certified\u003c\/strong\u003e\n\n\u003c\/li\u003e\n\n\u003cli\u003e\n\n\u003cstrong\u003eFill weight:\u003c\/strong\u003e 1005g (M) \/ 1100g (L)\u003c\/li\u003e\n\n\u003cli\u003e\n\n\u003cstrong\u003eOuter fabric:\u003c\/strong\u003e 10D 500T down-proof nylon\u003c\/li\u003e\n\n\u003cli\u003e\n\n\u003cstrong\u003eLining:\u003c\/strong\u003e 10D 500T down-proof nylon\u003c\/li\u003e\n\n\u003cli\u003e\n\n\u003cstrong\u003eZipper:\u003c\/strong\u003e Anti-snag YKK + double elastic drawstring\u003c\/li\u003e\n\n\u003cli\u003e\n\n\u003cstrong\u003eComfort temperature:\u003c\/strong\u003e -21.4°C\u003c\/li\u003e\n\n\u003cli\u003e\n\n\u003cstrong\u003eLimit temperature:\u003c\/strong\u003e -31.0°C\u003c\/li\u003e\n\n\u003cli\u003e\n\n\u003cstrong\u003eExtreme temperature:\u003c\/strong\u003e -58.7°C\u003c\/li\u003e\n\n\u003cli\u003e\n\n\u003cstrong\u003eThermal standard:\u003c\/strong\u003e GB\/T 38426-2019 \/ ISO 23537\u003c\/li\u003e\n\n\n\u003c\/ul\u003e\n\u003ch2\u003e850 FP extreme cold sleeping bag for mountaineering and winter bivouacs\u003c\/h2\u003e\n\u003cp\u003eThe Naturehike UL1100 is an \u003cstrong\u003eextreme cold sleeping bag\u003c\/strong\u003e filled with 850 FP white goose down, 95% down, with cleanliness certified at 1000mm and RDS certification. With 1005g of fill in size M, it is designed for bivouacking in challenging winter conditions where nighttime temperatures regularly drop below -15°C. The temperature range is measured according to GB\/T 38426-2019 and ISO 23537 using an instrumented heated mannequin (report ZINK-LAB2410037). The comfort rating of -21.4°C corresponds to a standard female user sleeping in a relaxed position. The limit of -31.0°C is the thermal equilibrium threshold for a male in a curled position. The extreme of -58.7°C is a theoretical survival threshold. These values assume the use of a sleeping pad with an appropriate R-value.\u003c\/p\u003e\n\u003ch3\u003eTriangular baffle construction and closed channels\u003c\/h3\u003e\n\u003cp\u003eThe \u003cb\u003etriangular baffle construction\u003c\/b\u003e distinguishes the UL1100 from standard square-baffle bags. The triangular geometry keeps each chamber at an independent volume with a reduced contact surface, which limits cold spots at the seams and accelerates loft recovery. The channels are fully closed at both ends to prevent any down migration. The 1100g version includes a \u003cb\u003ethermal side wall\u003c\/b\u003e that insulates the sides, a critical point of heat loss during prolonged winter bivouacs.\u003c\/p\u003e\n\u003ch3\u003e10D 500T fabric and triple storage system\u003c\/h3\u003e\n\u003cp\u003eThe \u003cb\u003e10D 500T nylon\u003c\/b\u003e outer fabric and 10D 500T lining combine down-proof performance with lightness. The \u003cb\u003eanti-snag YKK\u003c\/b\u003e zipper with double elastic drawstring, integrated thermal hood, and zipper baffle complete the peripheral insulation. Three storage systems: long-term storage mesh bag, transport bag, and extreme compression bag 24x25cm. Weight: 1.59kg in M.\u003c\/p\u003e","brand":"Duvet Nomade","offers":[{"title":"L","offer_id":53985642807633,"sku":"14:29#UL1100-L","price":1299.0,"currency_code":"EUR","in_stock":true},{"title":"M","offer_id":53985642840401,"sku":"14:173#UL1100-M","price":1299.0,"currency_code":"EUR","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0993\/9173\/4097\/files\/naturehike_ul1100.webp?v=1781042133","url":"https:\/\/duvet-nomade.com\/en\/products\/sac-de-couchage-grand-froid-naturehike-ul1100","provider":"Duvet Nomade","version":"1.0","type":"link"}