Choose the Karhu Fusion 4.0 and experience the perfect combination of comfort and performance while running with this neutral all-round running shoe. The Fusion 4.0 is an excellent shoe for daily runs, but also for tempo and interval training due to the fast character of the shoe. Get the most out of every step with this all-round running shoe!
Karhu shoes are all about comfort and a good fit. That is why Ortix Fit was developed. The Ortix Fit refers to the geometry of the midsole, the volume of the upper and the total dimensions of the shoe. To create its Ortix Fit, Karhu analyzed no less than 3 million foot scans. Then HiVo, the ideal shoe for men, and HeraFit, the ideal shoe for women, were developed.
Midsole
The midsole of this shoe is made of AeroFoam. This material patented by Karhu is lighter, more resistant to extreme temperature fluctuations and more durable than traditional EVA foam. In addition, the combination of injected nitrogen and 22 mm stack height at the forefoot ensures more energy return and reactivity. The last for women is specifically designed for the anatomy of the female foot. The name that Karhu uses for this is HeraFit. With the help of the Fulcrum technology and a propulsion plate, the midsole propels forward by offering balanced cushioning, more support and more energy during push-off.
Upper
The Fusion 4.0 has an upper made of Ideal Knit mesh, a comfortable fit and great breathability. The M-lock system ensures good foot locking while maintaining flexibility.
Outsole
With a rubber outsole, the shoe provides good grip and traction while running. Get the most out of your running session with the Karhu Fusion 4.0!
