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

Delivery & Returns

Delivery

We ship orders with in the USA, Mexico, Canada, Australia and New Zealand only. All web orders are shipped from Fife, WA. If you would like to obtain a proof of delivery email us separately, any lost packages or items must be claimed through/with the carrier selected for the shipment.

Please note that during national holidays in the USA we aren't shipping.

Please note that Karhu can't deliver to PO Boxes.

We allow 48 hours for order processing after order placement. This is rare but can occur during peak shipping seasons. All tracking information is emailed 24 hours after the order is shipped.

* For shipping to Alaska, Puerto Rico, Hawaii, AFA, AFE and AFP there is a different shipping of $14.95. 

** Orders valued more the $100.- will ship Economy Free of charge. Otherwise there will be a shipping fee of $7.95.

*** Orders shipped outside of the United States are charged a shipping fee of $29.95.

 Returns

If you choose to return your product from within the USA for a refund, we will provide a prepaid return-shipping label and a refund for the amount you paid for your purchase, minus a $5.00 restocking fee per item returned. 

If you choose to return your product from outside of the USA for a refund, you will have to return the product at your own expense. We will issue a refund for your purchase, minus a $5.00 restocking fee per item returned.

Only product purchased directly www.karhu.com can be returned to our return processing center. Any unauthorized return of Karhu product will not be accepted or processed at our processing center. The sender of unauthorized returns will be responsible for all return shipment costs.

Return shipment may be sent to:

Regal Logistics
6500-26th Street East
Fife, WA 98424 United States of America

Accompanied by this return form: download here

Important: Product must be clean and the box in proper condition to be accepted.

Under garments such as briefs, boxers, undershorts, underpants may not be returned for size exchange or refunds due to hygienic reasons we can not restock these items.

All sneakers must be in the condition you received them and in the original box.
Warranty related product returns must be shipped to the same address as listed above. All products returned for warranty related reasons will be inspected upon the return of the product.

Please allow 2-3 weeks for processing.

For shipments outside the US or special regions Karhu won't provide a return label. We do except your return taking into account the conditions mentioned above. Please note that you ship your return Duties and Taxes paid. 

Size guide

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.