Karhu  MEN'S FUSION 4.0 BLACK / STORMY WEATHER 

£112.00£140.00

SKU_F101013

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Size advice: Order 0.5 size bigger compared to your regular size.

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Fast & free shipping
30 days return policy
Finnish heritage since 1916

Run type

Faster run

Surface

Road

Guidance

Neutral

Cushioning

Neutral

Weight

302g in size US 10

Drop

6mm


The men's 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 Fusion 4.0 is also available in a wide fit, KARHU calls this High Volume (HiVo).

The KARHU Fusion 4.0 is the ultimate all-in-one shoe for runners seeking a unique blend of comfort, responsiveness, and performance.

Details Karhu Fusion 4.0
-Shortened Fulcrum + Propulsion unit for an efficient stride
-Nitrogen-infused AeroFoam midsole
-Updated IdealKnit mesh construction with improved breathability
-M-Lock lacing construction ensures a secure midfoot


The men's KARHU Fusion 4.0 is sure to elevate your run and propel you forward.

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.

Technologies Karhu Fusion 4.0
-Fulcrum + Propulsion Unit
-IdealKnit
-Ortix Fit
-Nitrogen-infused AeroFoam midsole
-M-Lock lacing system

Weight US10: 302g / 10.7 oz
Heel-to-toe drop: 6mm


We ship to most countries in the EU. Your order is prepared for shipment on business days the next morning after you placed your order. Typically, the warehouse is able to manage and send out your order the same day, or the next morning after they start processing it!

US Men's Size UK Size EU Size Shoes Length (mm)
8 7 41.5 263 mm
8.5 7.5 42 268 mm
9 8 42.5 272 mm
9.5 8.5 43.5 276 mm
10 9 44 280 mm
10.5 9.5 44.5 285 mm
11 10 45 289 mm
11.5 10.5 46 293 mm
12 11 46.5 297 mm
12.5 11.5 47 301 mm
13 12 48 306 mm
14 13 49 310 mm
15 14 50 315 mm
TECHNOLOGY

The KARHU Fulcrum technology is designed to keep all forces going forward, reducing braking forces and using your body's natural energy to create a smoother ride. It's what we call the Rolling Effect. Fulcrum Technology provides: Balanced Cushioning, Increased Support, More Energy. The Fusion features a three-quarter length fulcrum.

Karhu United Kingdom
Karhu United Kingdom

OrtixFit shapes your mid sole and upper volumes using data directly collected from over 4 Million runner's feet. What started in 2018 with the launch of the Karhu Ikoni the 1st model shaped by ORTIX, we now offer all our footwear models with our ORTIX Fit, based on actual scanning data in regular, HiVo (more volume) and Hera (women specific) Fit volumes. Karhu collaborates with Volumental(TM) and Fleet Feet(TM) create personalized fit experiences.

Karhu United Kingdom
Karhu United Kingdom

FUSION

Karhu United Kingdom

Guidance

Cushion

Propulsion

IKONI

Karhu United Kingdom

Guidance

Cushion

Propulsion

MESTARI RUN

Karhu United Kingdom

Guidance

Cushion

Propulsion

Customer Reviews

Based on 16 reviews
81%
(13)
13%
(2)
0%
(0)
6%
(1)
0%
(0)
J
Jonathan (United Kingdom)
How does it fit?:
Too small
Too big
Usual size worn: 9.5
Size purchased: 10.5
So disappointing

I'm having to return these as they're too tight. I ordered the size up as this website recommended, and I ordered the HIVO variant, so I was disappointed to find out that the tongue is elastically strapped to the base. Why would you design a 'high volume' shoe with elastic that straps your feet in with a vice grip? This makes them unusable for people who need more room within the shoe. Such a shame as the rest of the shoe seems good.

P
Pasquale D’Alessio (United Kingdom)
How does it fit?:
Too small
Too big
Usual size worn: 10.5
Size purchased: 10.5
Perfect Running Companion

As were my first Fusion 2021 these Fusion 4’s were hugely improved & so supportive & comfy.
Will always get Karhu for running shoes.

A
Anonymous (United Kingdom)
How does it fit?:
Too small
Too big
Usual size worn: 9
Size purchased: 9.5
wearing K since about 35 years.

Never had an issue with my feet. That is why I stay with these shoes. Perfect fit for me.

MEN'S FUSION 4.0 - BLACK / STORMY WEATHER

Size: