Introduction
Recently I got into a discussion with my dad about running shoes (mainly centred around durability concerns). Inevitably big companies have profit as a priority over durability. Although I think the companies do actually care, I don't think they pay attention to durability as much as they should. So my dad asked me how would I make a running shoe; I have had some time to ponder this and here is my answer:
Firstly, different configurations are good for different situations (race/train) and terrains (grass, track, trail, road). This shoe will be one I would be happy to use for all my training (50% trail, 30% road, 20% grass) and all my non xc racing (mainly road racing when you exclude xc).
So what do I want? I want close to zero-drop, lightness, durability, speed and less importantly, good looking.
Manufacturer
I have often asked myself whom I would like to be sponsored by if I were to become a big shot. I think that given my great impressions of the XCS4 and Adios 2, I would chose Adidas. The only problem is that they don't really deal in trail running, but hey, this is conjecture anyways. I would like Adidas to make my shoe because of their spot-on use of materials, attention to detail and polished look. I will not restrict myself to Adidas materials though.
Outsole
Here, I am tempted by the flat Continental Rubber on the bottom of Adidas' marathon shoes and the sticky rubber compound on the Inov-8 255's sole that has received so much praise.
The Adidas sole has the advantage of durability on the road and less luggy discomfort whereas the Inov-8 has the ability to really stick to fell material. I think that the Adidas' superiority on roads makes it a better choice as I prefer race performance to training performance. The Continental rubber is the most durable outsole material I have ever run in so it should easily protect a minimal midsole!
Midsole
This category again involves Adidas- the boost material's stat as the best energy returner on the market earns it a place on the shortlist. The Adiprene + from the now outdated Adios 2 has also impressed my with its responsiveness so this will have a shout. The u4ic midsole (and outsole) on the Mizuno Universe 5 is very light but is very weak and probably a bit squishy if you make it thicker.
I think that the Boost's lightweight, durable, energy efficient characteristics make it the right choice however we will need to get rid of that heel drop. Let's go all out and make it completely zero-drop and hope I would be able to adapt to it in time for a marathon.
To make it light, we'll go with a 10mm flat stack height and to give it that very Adidas snap, we'll put in that bit of yellow plastic they can a torsion system. In order to make this shoe a little more versatile and suitable for longer distances, I would include a set of insoles so you can swap and change the stack height to suit the distance. I'm thinking (in mm, heel-toe) 4-1, 4-4, 7-1, 7-4, 7-7, 10-1, 10-4, 10-7, 10-10.
Upper
So far we've basically made an Adidas shoe but here in the upper, I don't think Adidas have enough durability (if only they made randed shoes). It should be obvious by now that I want want want more randing on shoes. How much? I think the Inov-8 x-talon 212 does it nicely leaving no possible points for breaking to occur. I might reinforce it a little just to make sure:
I would also keep the pull on strap at the back of the heel and the lace eyelets which transmit the tension down to the sole so that the laces do not pull on the weak upper. I would however replace the thick material of the top of this shoe with the extremely light upper from the Mizuno Universe 5 since I have never had a failure in this area and it would allow the shoe to breath and be light!
I would use a very minimal tongue- Like the one used on the Universe 5 but I would take away that silly plastic 5 at the top which just gets in the way.
I would then give it to Adidas to paint perhaps asking for red or orange- I love their designs!
Summary and weight
Given what I have specified, I would expect this shoe to have a weight around 100g and it should be rather durable, fast and good looking!
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