Women's Shoes Karhu

KARHU Fusion 2021


The Karhu Fusion Ortix 2021 delivers unbeatable cushion and fast transitions to your everyday runs.

Built on top of Karhu’s unique AeroFoam midsole, the Fusion Ortix 2021 is lightweight and more temperature resistant than shoes built with EVA midsole foam. Maximum cushioning in the forefoot creates super-soft landings while an added propulsion unit energizes take-offs.

A shortened, 3/4-length Fulcrum embedded in the midiole of the Fusion Ortix 2021 concentrates cushioning toward the heel and midfoot, creating a responsive rocker that stabilizes each step and pushes you forward.

The upper is constructed from Karhu’s super-breathable, lightweight Ideal Knit mesh that supports your foot on top of the midsole for an all-around comfortable fit.

Karhu also created a high-volume option for wider feet. The Fusion 2021 HiVo provides a wide width for runners who need a little more space.

Tech Specs

Karhu Fusion Ortix 2021


8.8 oz (W) 10.5 oz (M)


6 mm




Everyday training, racing



What's New + -

While the nuts and bolts of the Karhu Fusion Ortix 2021 are the same as previous versions, the new edition is lighter with a sleeker upper to shed ounces. The AeroFoam midsole is as cushy as ever, but the adjusted Fulcrum and propulsion unit create a faster transition in this version than the previous models.

Who It's For + -

The Fusion Ortix 2021 is a neutral shoe that packs a punch when it comes to cushioning. Whether you’re looking for something comfy to walk in or need a shoe that can absorb impact over long miles, the Fusion Oritx 2021 is for you.

Why You'll Love It + -

Great for everyday training or road races, the Fusion Ortix 2021 is a versatile shoe that provides plush cushioning and quick transitions.

Reviews (5)

4.8 out of 5 stars.

4.8/5 on 5 total reviews

Rhonda Verified Buyer
5 out of 5 stars.
Awesome shoes

I love these shoes!! They are super light and have really helped with my sciatica pain. Most shoes I can't wait to get off but these I can go all day and not think about them.

Maura Verified Buyer
4 out of 5 stars.
love these sneakers

I needed to re-order the HiVo version of these shoes b/c I had issues w/my left big toe mound. And also had to take out the insert that comes with the shoe and replace with an insert for arch support without extending into the toes to give them more room. This worked and my runs are awesome. My pace has improved. Love the cushion. Other than needing more toe space, the fit is incredible. my foot feels supported and wraps around the top of my foot, feels super comfortable. My toe issue is improving and probably needed these new sneakers a lot sooner and I could have avoided this issue.

H Collingwood Verified Buyer
5 out of 5 stars.
Karhu Fusion 2021

These are my favorite shoes. The Fleet Feet salesperson, Claire, made sure I was entirely comfortable in my new shoes and with the inserts I needed before she ordered the black Karhu shoes that I wanted. Then the shoes arrived by mail promptly.

Jane Hickman Verified Buyer
5 out of 5 stars.
My new Karhu shoes❤️

My sales rep at the Columbia,Mo. Fleet Feet store recommended the KARHU shoe to me to help with a problem I was having with a foot. It has been amazing. Have hardly any issue after just a couple of weeks of wearing them. Thank you Fleet Feet! I’m a loyal customer

Kathy Verified Buyer
5 out of 5 stars.
Love my Karhu Fusion 2021 Running Shoes

Christiana did a fantastic job! She listened to my needs, measured my feet, checked for pronation and gait, and came up with three different pair of running shoes for me to try, any of which would have been fine. I chose the Karhu shoes because they had the most ample toe box, both in width and in height, and had plenty of cushion. I used to wear a size 8 in a running shoe but Christiana’s thorough measurements revealed that I should be wearing a size 9 now, and the fit is perfect. Fleet Feet was out of white so Christiana ordered them online for me. I received them at my home 25 hours after I walked out of the store — amazing! My Karhus required no break-in time. I ran 3 miles in them right out of the box. Also the store took all the necessary precautions to make it safe to come there during the pandemic. You need to make an appointment and wear a mask; large square blue outlines mark the floor to keep customers properly distanced, and only a few customers at a time are allowed in the store. The whole experience was excellent and I love my new Karhu running shoes! Thank you, Fleet Feet and Christiana!

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