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

Consegna e resi

International Delivery 

Karhu is an international brand and 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! Currently we aren’t able to offer you express shipping in the EU. The transit times below are indications of the transit time after your order has left the warehouse. Please note that our European warehouse is located in the Netherlands. On local holidays our warehouse is closed. 

Returns, Refunds and Exchanges 

We offer a 14 day return policy. If you choose to return for a refund, we'll provide a prepaid return-shipping label and a refund for the amount you paid for the returning item, minus a €5.00 restocking fee per return. The prepaid return-shipping label is included in your shipment (Except for Finland and France, for orders placed after 01-07-2020, please read details below), in case the return label is missing in your shipment, you must notify us at customerserviceEU@karhu.com within 14 days of the date the product was delivered to you. The returned product must be received by our facility within 21 days of the date the product was delivered to you. We will process your refund as soon as possible, after we have received the returned product, and within a maximum of 30 days.

All purchases done in stores, need to be returned at the store of purchase. We are not able to receive any returns of store bought products.

Please note that we do not offer product exchanges at this moment.

Returns from Switzerland & Norway:  

If you choose to make a return from Switzerland or Norway, you may choose any carrier for the return shipment. The shipment must be delivered to the address of our European warehouse (see below) for a refund. The returned product must be received by our facility within 21 days of the date the product was delivered to you and be in proper condition. We will process your refund as soon as we have the returned product and within a maximum of 30 days. 

When a customer would like to receive a refund, they must send the return shipment at their own cost (including duties and taxes) to the following return address: 

Bleckmann Nederland BV 

C/O Karhu 

Nijverheidsstraat 28 

7575 BJ Oldenzaal 

Guida alle taglie

STEP 1

Place a piece of paper on the floor with one end against the wall. Put your foot on the piece of paper with your heel against the wall.

STEP 2

Take a pencil and mark the end of your longest toe on the paper. Repeat for your other foot.

STEP 3

Measure in cm from the wall (heel) to the longest point (toe). Take the larger measurements. Than take what you measured + 0.5 CM and compare it with our shoe sizes in the size chart.