The women's Fusion 4.5 is the latest iteration of Karhu's Fusion line, designed as a plush and propulsive neutral trainer. It features a streamlined fit that aids in a smooth transition from heel to toe-off.

• Refined IdealKnit mesh for enhanced breathability and comfort
• Added reflective details for improved visibility
• Redesigned tongue for a softer, more accommodating, and premium feel
• Nitrogen-injected AeroFoam midsole for better rebound and cushioning