KARHUKarhu Fusion 4.0 'Black Stormy Weather'

An outlined side logo and sculpted midsole give the Karhu Fusion 4.0 'Black Stormy Weather' (F101013) a defined look. This men's running shoe combines a dark upper with a contrasting light sole for a clear, two-tone profile. The black IdealKnit mesh upper has black laces and a Stormy Weather grey heel panel. A pale grey outline accents the side logo, while the midsole is light grey with a ridged lower edge and the outsole is black. Karhu introduced the Fusion 4.0 in 2024. Designed for neutral-footed runners, it uses nitrogen-infused AeroFoam cushioning, a quarter-length Fulcrum and propulsion unit to guide the foot forward, and a deflection channel beneath the midsole to help absorb impact.