Sleep where others don't dare to go
Arctic expedition sleeping bag
Sirius® exp -35
Developed with current and former members of Greenland’s Sirius Dog Sled Patrol, SIRIUS EXP combines Nordisk’s sleeping bag expertise with first-hand experience of Arctic travel.
Down insulation, dedicated arm openings and adjustments within reach support warmth and practical use during long expeditions. Successive prototypes were refined through field testing, with user feedback shaping the details of the bag.
Four-person expedition tent
Sirius® 4 exp
SIRIUS 4 EXP is a four-person tunnel tent designed for year-round expeditions. Its construction brings together strength, ventilation and space for the team and its equipment.
From winter journeys to summer camps, it provides a base for rest and preparation between days on the move.
Sirius® exp -35° sleeping bag
Built with expert users
Developed with current and former members of the Sirius Dog Sled Patrol, drawing on their experience of Arctic expeditions.
360° equal-fill insulation
Equal down filling on the top and underside provides insulation around the body as you change sleeping position.
Filled and finished in germany
Individually filled, finished and quality-controlled at Nordisk’s own manufactory in Görlitz, Germany.
The origin
Start with the people who sleep there
In Arctic conditions, the smallest adjustment can become a daily challenge. Reaching for equipment, closing a collar or finding the right drawcord has to work with cold hands and limited light.
During development, Sirius Patrol users helped Nordisk identify these practical needs. Their input shaped the arm openings, pocket placement, hood closure and controls that can be recognised by touch.
Workshops and successive prototypes allowed those ideas to be tested and refined. The result is a sleeping bag designed around the routines of expedition life, as well as the hours spent asleep.
cold is a constant. so is this bag
EVERY DETAIL HAS A REASON
Access to equipment. Adjustment from inside the bag. Insulation around the body. Each detail addresses a practical need identified during development.
Adjustable hood
Adjustable from inside, with a frost guard visor and frost baffle around the opening.
Two-way centre zip
Easy access and ventilation, with insulated baffles and a jam guard for smooth operation.
Full-wrap thermal collar
Surrounds the shoulders to help retain warmth and limit draughts.
Dedicated arm openings
Handle equipment with your arms free while keeping your torso inside the insulated bag.
Sharkfin double footbox
A shaped, insulated footbox designed for warmth and comfort around your feet.
Tested in the field
Out of the workshop. Into the cold.
A process of testing and refinement
Every journey informed what came next
Early field testing
NORWAY:
Former Sirius Patrol member Erik B. Jørgensen took an early prototype on a 21-day, 418-kilometre journey in northern Norway. His feedback informed the next stage of development.
Prototype refinement
NORWAY & SWITZERLAND:
Further prototypes underwent laboratory and field testing. Workshops and user feedback helped refine the hood, adjustments and access to the bag.
Extended use
FINLAND & GREENLAND:
Later field testing and expedition use took SIRIUS EXP into Finnish Lapland and Northeast Greenland, adding experience from extended journeys in ice and snow.
Made for the long haul
Expertise you can keep returning to
SIRIUS EXP is filled, finished and individually quality-controlled at Nordisk’s own manufactory in Görlitz, Germany.
That expertise continues after the bag leaves the filling table. Nordisk’s Care & Repair team offers specialist washing, refilling and repairs to help maintain down products through years of use.
Care is part of preparing the bag for its next journey.
SIRIUS® 4 EXP
THE THINKING BEHIND THE TENT
Built around life in camp
Rest, equipment and preparation all need room. SIRIUS 4 EXP has an inner tent for four extra-wide sleeping mats, two vestibules and five entrances, giving the team flexibility around camp.
Its SilPoly flysheet stays taut when wet. DAC aluminium poles and Nordisk’s Power Guy-Out System support the structure, while ventilation options allow adjustment to changing weather.
Scandinavian Outdoor Award
True Scandinavia Award winner
SIRIUS 4 EXP received the True Scandinavia Award for Spring/Summer 2027, ahead of its planned launch.
After testing in Trentino, Italy, the jury highlighted the tent’s versatility, interior space and ventilation. The award recognises how these features work together in a shelter for year-round use.
A closer look
Built around arctic use
A laminated ripstop nylon shell combines waterproof fabric with breathability to help protect the European goose down from external moisture. The 360° equal-fill construction uses equal down filling on the top and underside, with a lightweight ripstop nylon lining inside.
A two-way centre zip and separate arm openings provide access and ventilation options. The hood can be adjusted from inside the bag, while the full-wrap thermal collar and insulated zipper baffles help retain warmth and limit draughts.
SIRIUS EXP is offered in M, L and XL sizes. Nordisk’s manufactory can discuss expedition-specific filling and personalisation options. Contact Nordisk to select the appropriate size and configuration for your journey.
Consider the sleeping bag as part of a complete setup, alongside your insulated mat, shelter, clothing and approach to moisture management. Temperature guidance must relate to the specific bag configuration and intended conditions, with individual sensitivity to cold taken into account.