The Karhu Fusion 4.0 is designed for neutral runners seeking a plush and propulsive experience. This iteration enhances the shoe's ability to facilitate a smooth heel-to-toe transition, offering a responsive feel across various paces.

• IdealKnit mesh upper for enhanced breathability and comfort
• Midsole features nitrogen-injected AeroFoam for increased rebound
• Deflection channel in the midsole aids in impact absorption