First impressions: Diadora Mythos Fly

Diadora came into the Danish running market last year with their new technology, BlueShield, an orthopedic top sole that would enhance the support underneath each foot. This made the shoe able to support overpronators as well as supinators to various degrees and make them run more neutral.

Last years shoe has been received well by our customers, but there were some issues that I hoped they would fix in the next generation. 

A week ago I got the Diadora Mythos Fly, a second generation BlueShield shoe made to be lighter and faster than their original Mythos. I have just finished 34k in them and it is, therefore, time to give my first impressions on the shoe. 

The fit

This is the main improvement! The last generation of Diadora shoes was based on a good foot shape, but it was a shoe that we were only able to sell to people with a taller midfoot or that needed extra vertical space in the toe box. We told Diadora this during our test phase and quickly got a response that this would be fixed in the next generation.
The upper has thus been changed completely, resulting in a lot tighter fit, especially in the toe box. Be aware though, that this is not a wide shoe, and it will not suit people with wider feet as well.
The grip around the midfoot and heel is like last year, good. The shoe is not overly padded in the heel like running shoes have a tendency to be now, resulting in a firm and good fit around the ankle that doesn't feel too soft.

It’s one of those shoes you forget is on your feet when you wear them.
— Lars Ivar Henriksen

Overall, this shoe is remarkably different from its predecessor, with a much more secure fit around the entire foot. It's one of those shoes you forget is on your feet when you wear them.

I ran to work every day last week with the Diadora Mythos Fly.

The stability

The initial test on a treadmill showed that this shoe is capable of handling some overpronation, but as it is the lightest and most flexible it also lacks a bit of stability compared to the to stiffer shoes in the Mythos line-up.
It's clearly not designed to be the most stable, but it is nice to see that the BlueShield inner sole can offer some support, especially for those with a weaker foot arch that could be in need of an extra innersole. Severe overpronators should look for a different shoe though, and this is where the other more stiff Diadoras would be possible options.

The feel

The first feeling when you put on this shoe is that it is comfortable. The BlueShield sole has an initial supporting feel under the foot, and as soon as the sole settles and forms to your foot, a softer sensation is replaced by a more responsive comfort. I've had no issues with using this shoe for longer periods at work, even though it was new and unfamiliar.

The Fly has roughly the same weight as the Mizuno Inspire and a little bit heavier than the Saucony Guide. It fits perfectly into the category of lighter long distance trainers, but has more similarities to a Mizuno in feel than it has to the softer Sauconys.
Responsiveness is the key here, as the sole is firmer it leads to a more responsive touch when you land. This is always the key aspect of how the shoe performs. Many brands hide behind high energy return numbers, but this can be because they have a soft shoe that feels unresponsive. The Diadora Fly feels rather fast for its type and it is a joy to run with.

Grip has so far not been an issue as long as there isn't frost on the ground. It's a shoe that could be used in different types of terrain as long as it's dry.


This shoe is one of those shoes that you put on if you want a higher cruising speed throughout your run, but still wants some cushioning. The firm midsole reduces energy loss in every stride and the orthopedic topsole gives a bit of support when the ankle becomes tired.
Everything from shorter to longer distances is something I would consider using this shoe for, as long as the goal is to run at a faster pace. When speed isn't a big concern though I would imagine myself using a shoe that has a bit softer ride.

The most important impression I have from using the Diadora Fly is that it feels like the Diadora brand really has started to find its way onto the running scene. It's impossible to make a shoe that can do everything, and this shoe is not an exception. But what it can do it does well, and it is ready to compete with the big dogs!

Do you have any questions to me about this shoe or any other? Comment on this post or write to me on Instagram.