Cookie preferences This website uses functional cookies, analytical cookies and marketing cookies. Below we explain the different cookies. You can choose which cookies you agree to.
Functional cookies ensure that the website functions properly. These cookies are therefore enabled by default.
Analytical cookies help us analyze the use of the website so we can continuously improve it and provide an optimal user experience.
These cookies ensure that you see advertisements that are tailored to your interests; for example on social media and external websites. If you do not accept these, you may encounter advertisements that are less relevant to you.
Cookie preferences 21RUN uses cookies and similar techniques ("cookies") to offer you an optimal user experience, to keep the website reliable and safe, to show you relevant advertisements, to measure your browsing behavior, to make our own channels more relevant and more personal and to offer you relevant advertisements on social media and external websites. Click on 'Accept cookies' to agree. Privacy
Start your running routine every day with the trusted stability and comfort of the Karhu Fusion 4.0. The perfect all-round running shoe for your daily runs. Experience the ultimate performance of the Fusion 4.0 every day.
Midsole
Karhu's AeroFoam is used to make the midsole of this shoe. This material is lighter, more resistant to temperature changes and more durable than traditional EVA foam. The midsole of this shoe is made of AeroFoam Trail. This material, patented by Karhu, is lighter, more resistant to extreme temperature changes and more durable than traditional EVA foam. With the help of Fulcrum technology in the midsole, this shoe moves forward through a balanced cushion and therefore offers more support. The propulsion plate will give you extra stability while walking and the plate also propels you forward.
Upper
The Fusion 4.0 has an upper made of Ideal Knit mesh, a comfortable fit and great breathability. The M-lock system ensures that the foot is firmly locked.
Outsole
With a rubber outsole, the shoe provides good grip and traction while running. Order now and experience the versatility of the Karhu Fusion 4.0, delivered to your home within a few days!