KARHU 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.
-Shortened Fulcrum + Propulsion unit for an efficient stride
-HeraFit: women's specific last
-Nitrogen-infused AeroFoam midsole
-Updated IdealKnit mesh construction with improved breathability
-M-Lock lacing construction ensures a secure midfoot
The KARHU Fusion 4.0 is the ultimate all-in-one shoe for runners seeking a unique blend of comfort, responsiveness, and performance.
-Shortened Fulcrum + Propulsion unit for an efficient stride
-HeraFit: women's specific last
-Nitrogen-infused AeroFoam midsole
-Updated IdealKnit mesh construction with improved breathability
-M-Lock lacing construction ensures a secure midfoot
Stylish and propulsive, you will be excited to lace up the Karhu Fusion 4.0.
Get ready for quick, cushioned runs, this shoe is streamlined to work whether you are running long distance or kicking it up a notch with some tempo work. Our testers loved the smooth and snappy feel of their runs in our Karhu Fusion 4.0 review. Plus, with its new knit upper, it looks great for casual wear as well.
Details:
- Upper: The stylish Ideal Knit upper feels as good as it looks with a snug, streamlined fit. Featuring Karhu’s signature M-lock midfoot fit, you will feel secure as you rock your runs.
- Midsole: The nitrogen-infused AeroFoam cushioning is responsive and snappy and when combined with Karhu’s Fulcrum technology, creates a swift and efficient underfoot feel.
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Tech Specs |
Karhu Fusion 4.0 |
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Weight |
10.0 (Men’s size 10), 7.9 oz (Women’s size 8) |
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Heel-to-toe drop |
6 mm |
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Stack height |
Heel: 28 mm / Forefoot: 22 mm |
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Category |
Neutral |
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Use |
Everyday training |
What’s New
Karhu updated the Fusion 4.0 with a new look and feel. A brand new Ideal Knit upper gives you plenty of style, while still fitting and feeling great during the run. Karhu revamped the midsole with the nitrogen-infused AeroFoam cushioning to give you a plush and propulsive ride.
Who It’s Best For
The Karhu Fusion 4.0 is a snappy and propulsive neutral ride that’s ideal for those with a high, rigid arch and performs well whether you are doing long runs or tempo workouts.
Why You’ll Love It
You will love how efficient and propulsive running feels in the Karhu Fusion 4.0.
New year, new midsole
When it comes to all of the “new year, new me” trends, Karhu went all in. The Fusion franchise isn’t going on a crash diet or participating in Dry January, instead it’s sporting a completely redesigned midsole.
The Fusion 4.0 still uses Karhu’s proprietary AeroFoam cushioning, only it’s now nitrogen infused, giving it a more energetic and reactive feel. And it’s done something that most New Year’s Resolutioners can only dream of doing–bulked up while losing weight.
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