• Karhu Shoes Karhu Men's Fusion 4.0 in Sky Gray/Green Flash - Up and Running
  • Karhu Karhu Men's Fusion 4.0 in Sky Gray/Green Flash - Up and Running
  • Karhu Karhu Men's Fusion 4.0 in Sky Gray/Green Flash - Up and Running
  • Karhu Karhu Men's Fusion 4.0 in Sky Gray/Green Flash - Up and Running
1 4

Specifications

Highlights:

Daily Training

Daily Training

Support Level:

Support Level describes how much lateral stability a running shoe provides to help guide your foot through its stride. Neutral shoes are best for runners with a natural gait who don’t want/need extra correction. Support shoes add some structure to reduce mild overpronation, while Maximum support shoes offer the highest level of stability for those who need stronger motion control
 

Neutral

 

Support

 

Maximum

Cushioning Level:

Cushioning Level refers to the amount of padding in the shoe’s midsole that helps absorb impact while running. Minimum cushioning provides a lighter, more connected feel to the ground, Medium offers a balance between comfort and responsiveness, and Maximum delivers the most protection and softness underfoot at the expense of ground feel.
 

Minimum

 

Medium

 

Maximum

Cushioning Feel:

Cusioning Feel describes the character or sensation of the shoe’s cushioning. Responsive shoes feel springy and energetic, helping propel each step forward. Balanced cushioning offers an even mix of softness and firmness, ideal for versatile training, while Plush cushioning feels soft and luxurious, prioritizing comfort and shock absorption.
 

Responsive

 

Balanced

 

Plush

Grip Level:

Grip Level measures how well the shoe’s outsole grips the running surface that it was designed for (i.e. road, trail etc.). Minimum grip is best for surfaces where traction demands are low, medium grip handles a variety of road and light trail conditions, whilst Maximum grip provides strong traction even on uneven, wet, or slippery terrain.
 

Minimum

 

Medium

 

Maximum

Weight:

302g

Drop:

6mm

Overview

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

Delivery & Returns

UK DELIVERY OPTIONS (allow 3-5 working days)

  • FREE UK Mainland* delivery for orders over £100 
  • £4.99 UK Mainland* delivery for orders under £100 

We have teamed up with Royal Mail to ship your goods as quickly and efficiently as possible.

We aim to have your order ready for dispatch within 48 hours of receipt. If an order is placed after 1PM Friday please allow 48 hours from the following Monday, however it may not always be possible to meet these timings, especially at very busy times. In this case we will endeavour to contact you and update you on the status of your order as soon as possible.

Products available for pre order will be clearly marked online and cannot be dispatched before the date relating to that product specified. For more information regarding delivery & returns please click here

Size Guide

Reviews

Price Match

What is our Price Match?

Our Price Match is simple. At Up & Running, we want to be sure that our customers are getting the best deal on the market. This is why we offer our Price Match across some of our products, instore and online.

If you can find the exact same product cheaper in stock elsewhere, we will refund the difference.

Products must be over £50. Price Match does not apply to electronics.

For full information on Price Match, please click here.

Karhu Logo

Karhu Men's Fusion 4.0 in Sky Gray/Green Flash

£84.00
£84.00 £140.00 Save £56.00
Select Size (UK)

Specifications

Highlights:

Daily Training

Daily Training

Support Level:

Support Level describes how much lateral stability a running shoe provides to help guide your foot through its stride. Neutral shoes are best for runners with a natural gait who don’t want/need extra correction. Support shoes add some structure to reduce mild overpronation, while Maximum support shoes offer the highest level of stability for those who need stronger motion control
 

Neutral

 

Support

 

Maximum

Cushioning Level:

Cushioning Level refers to the amount of padding in the shoe’s midsole that helps absorb impact while running. Minimum cushioning provides a lighter, more connected feel to the ground, Medium offers a balance between comfort and responsiveness, and Maximum delivers the most protection and softness underfoot at the expense of ground feel.
 

Minimum

 

Medium

 

Maximum

Cushioning Feel:

Cusioning Feel describes the character or sensation of the shoe’s cushioning. Responsive shoes feel springy and energetic, helping propel each step forward. Balanced cushioning offers an even mix of softness and firmness, ideal for versatile training, while Plush cushioning feels soft and luxurious, prioritizing comfort and shock absorption.
 

Responsive

 

Balanced

 

Plush

Grip Level:

Grip Level measures how well the shoe’s outsole grips the running surface that it was designed for (i.e. road, trail etc.). Minimum grip is best for surfaces where traction demands are low, medium grip handles a variety of road and light trail conditions, whilst Maximum grip provides strong traction even on uneven, wet, or slippery terrain.
 

Minimum

 

Medium

 

Maximum

Weight:

302g

Drop:

6mm

Overview

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

Delivery & Returns

UK DELIVERY OPTIONS (allow 3-5 working days)

  • FREE UK Mainland* delivery for orders over £100 
  • £4.99 UK Mainland* delivery for orders under £100 

We have teamed up with Royal Mail to ship your goods as quickly and efficiently as possible.

We aim to have your order ready for dispatch within 48 hours of receipt. If an order is placed after 1PM Friday please allow 48 hours from the following Monday, however it may not always be possible to meet these timings, especially at very busy times. In this case we will endeavour to contact you and update you on the status of your order as soon as possible.

Products available for pre order will be clearly marked online and cannot be dispatched before the date relating to that product specified. For more information regarding delivery & returns please click here

Size Guide

Reviews

Price Match

What is our Price Match?

Our Price Match is simple. At Up & Running, we want to be sure that our customers are getting the best deal on the market. This is why we offer our Price Match across some of our products, instore and online.

If you can find the exact same product cheaper in stock elsewhere, we will refund the difference.

Products must be over £50. Price Match does not apply to electronics.

For full information on Price Match, please click here.

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