In 2025, Klättermusen proudly stepped in as Head Partner for the Sörmlands 50K, marking a milestone in our 50th anniversary celebrations. And we’re not stopping there—2026 is all about going further. We’re deepening our commitment to the outdoor community and forging exciting new partnerships to keep the adventure alive.
Klättermusen x Fjällmaraton 100K
February 23, 2026
We are proud to announce a new partnership with Kia Fjällmaraton Årefjällen, where Klättermusen becomes the Head Partner to the Fjällmaraton 100K - continuing to build on our growing commitment to the trail running community following our recent partnerships with Sörmlands 100 and Lofoten Ultra- Trail.
Kia Fjällmaraton Årefjällen is a cornerstone of Nordic trail running, and a race that means a great deal to us. Set in technical mountain terrain, with a strong sense of community and deep respect for nature, it takes place in Åre — a place that is central to Klättermusen’s identity and very much our backyard.
This collaboration extends well beyond race day and beyond borders. Through pre-runs, in-store activations, and a strong on-site presence during race week, we connect with our trail running community both locally and internationally — from Sweden to cities like Paris — sharing experience, building relationships, and supporting runners as they prepare for the challenge that awaits in Åre.
Klättermusen x Peak Divide
February 23, 2026
Klättermusen is proud to be Peak Divide’s Official Apparel Partner in 2026. Covering both their 2-day Classic event in April and ONEr in October, we’re excited to support the running community in the heart of the UK.
The Peak Divide is an adventure for the ultra-curious anyone who has wondered what big back-to-back days outdoors might be like, in good company. Taking place from Manchester to Sheffield with the Peak District in between, it’s a journey, not a race.
Klättermusen x The Arctic Triple
January 7, 2026
We are proud to announce that Klättermusen is stepping in to support the legendary The Arctic Triple, becoming the head partner for Lofoten Ultra-Trail.
In 2026, we continue to deepen our commitment to the trail running community. This time, our path leads north, into one of the most dramatic and awe-inspiring landscapes on earth: the Lofoten Islands. Becoming a partner to Lofoten Ultra- Trail means aligning with a race that embraces raw nature, real challenges, and the unmatched spirit of human endurance.
Our shared values make this partnership a natural fit. Lofoten Ultra-Trail is built on authenticity - an experience shaped entirely by the land, the culture, and the people of Lofoten. At Klättermusen, we believe in doing things with intention, with respect, and with deep care for the environments we move through. Together, we aim to create something meaningful for everyone who chooses to step onto those trails.
The Arctic Triple has always been about delivering the full experience of Lofoten - its rugged beauty, its people, its culture, and its challenges. We want every participant to leave with a memory for a lifetime. Klättermusen shares that drive for authenticity and respect for nature, and their commitment strengthens what we can offer all who take part.
Frank Hagen, Founder, The Arctic Triple
Klättermusen x Sörmlands
December 11, 2025
We are Becoming the Head Partner for both Sörmlands Winter Trail and Sörmlands 100.
In 2025, Klättermusen entered as the Head Partner for the Sörmlands 50K, as part of our 50th anniversary celebrations. This year, we are proud to announce that we are becoming the Head Partner for both Sörmlands Winter Trail and Sörmlands 100, across all distances.
Our shared mindsets have become the perfect match to take this partnership further. We care deeply about the outdoors, doing things a little differently, and bringing people together. The reasons are simple – it's about showing up, being part of something real, and supporting the people who make trail running what it is.
