Karhu Men's Fusion 4.0 Running Shoe

The Fusion 4.0 provides a plush and propulsive ride ideal for the neutral runner. New additions and adjustments to the Fusion 4.0 make this shoe exceptional at seamlessly accelerating the transition from heel to toe-off, ensuring a responsive underfoot experience regardless of pace. This update utilizes soft IdealKnit mesh for improved breathability and comfort. Most notable is the incorporation of new nitrogen-injected AeroFoam in the midsole. This upgraded foam provides increased rebound, while the addition of a deflection channel at the bottom of the midsole helps absorb impact and provides a more cushioned experience. The KARHU Fusion 4.0 is the ultimate all-in-one shoe for runners seeking a unique blend of comfort, responsiveness, and performance. At KARHU, we know every runner has unique feet, and it’s this as our starting point that has resulted in the newly updated Fusion 4.0. The Fusion 4.0 is also available in a wide fit, KARHU calls this High Volume (HiVo). The KARHU Fusion continues to be built on a growing database of over 4 million 3D scans from runners’ feet.

• ENHANCED COMFORT & BREATHABILITY: The Karhu Fusion 4.0 features an upgraded IdealKnit mesh upper in a stylish brindle pattern, enhancing breathability and keeping your feet cool and comfortable. Paired with superior AeroFoam cushioning infused with nitrogen, it offers exceptional rebound and support for a plush, cushioned ride.
• SIZE RECOMMENDATION: For the best fit, we recommend sizing up a full size compared to your regular size.
• RESPONSIVE RUNNING: Designed for peak performance, the Fusion 4.0 offers a smoother transition and enhanced toe-off thanks to its increased toe spring and rockered midsole shape. The innovative deflection channel in the midsole absorbs impact effectively, reducing strain on joints and enhancing your running experience.
• HIVO: Available in both medium width and HiVo (Wide). More than just “wide,” HiVo provides a higher volume upper to accommodate thicker or broader feet, and feet with common problems like bunions, calluses and corns.