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Are you seeing a pattern yet? Yes, I am becoming a huge fan of the 6 year-old running shoe company known as Altra. As I have been instructing clients in form techniques, and have found that most of the models Altra manufactures, lend themselves to my favorite principles.
The Altra Impulse is no different.
What I like about the Altra Impulse
As with all of Altra’s models, my favorite advantage is their FootShape™ Toe Box. This is the incomparable wide toe box that Altra is known for. The toe box is makes any of Altra’s models recognizable from a good distance away. That is how wide it is. I enjoy the ability splay my toes and have my feet firmly hit the ground without them being cramped up. Wider toe boxes also allow the feet to develop more strength because the shoe is not tightening around the ball of the foot or the toes. The toes can move around, and tackle all kinds of terrain.
As you can see from the x-ray below, the amount of splay the toes are allowed in the Altra vs a traditional toe box. Imagine having access to the full splay of your foot while you run. What is amazing is that most runners do not even realize the limits that a traditional toe box causes. (Hmm, maybe there is an idea for a full post.)
The Altra Impulse is no different in this department. The FootShape™ toe box has been incorporated and has all the comforts of the other models I have run in.
I love the Zero Drop™ technology that Altra incorporates. When I run I have the ability 
to utilize the full power and flexibility of my calf not to mention I can run as if I was barefoot, as our bodies were intended. Most traditional running shoes have a 12mm heel drop. This means that the heel is 12mm above the ball of the foot.
When we are barefoot, the heel and the ball of the foot are equal which is a Zero Drop™. This also helps with heel striking. Have you ever tried to heel strike while running barefoot? Even if you are a regular heel striker in shoes, it is almost impossible to heel strike while bare foot running. A huge effort has to be made to do that.
So, why runners continue to heel strike? If your heel is more cushioned in the shoe, then of course you will want to hit that area first. (Another post may be needed to explain a little more on this too…stay tuned.)
I love the Innerflex™ which are grooves at the bottom that create a more flexible sole.
One of the huge differences with the Altra Impulse is that they also incorporated their patented StabiliPod™ technology along side the Innerflex™. Now you have a stability shoe that is also somewhat flexible.
I have decided to put this feature as a liked feature more for others than myself. As a pure neutral runner I prefer to work allowing my body to support me, not my shoe, but Altra is marketing this shoe not only for running and triathlon, but for cross training as well.
The StabiliPod™ technology does really help in moving laterally, which is not something that is usual for runners, and especially those of us whom usually stick to the pavement. This is why I do like this feature.
My absolute favorite feature of this shoe are the drainage holes in the sole. My very last test run with the impulse was an 8 mile run, immediately following a huge rain storm here in Tampa, Florida.
My route took me through numerous ankle deep puddles and while my socks remained damp, the shoe was clear of water within a few yards of the puddle. There was no squish from the sole of the shoe or my sock because as my foot pushed down on the shoe, the holes squeezed water out the holes. No more blisters from soaked uppers and water log socks release water as well.
The Altra Impulse also continues with Altra’s A-Bound™/EVA blend compound which sits directly under the foot and adds a return of energy and reduces ground impact.
The upper is a light material and does have a noticeable difference from the other models. The tongue and laces are curved with the shape of the shoe which differs from the straight tongue of traditional running shoes.
I actually enjoyed this new feature. The fit of the shoe felt more comfortable with the tongue falling in the same curve as my foot.
I rarely run without socks, but I did end up having to do go out for a couple of miles one day without socks, and they were extremely comfortable. While the upper is not seamless it is very close. There are only a couple of seems that surround the tongue, but they are covered with a light fabric that helps reduce any friction.
What I wasn’t so crazy about
This is probably a very individual issue, but even though I sized up to a 10 from a 9 and a-half, after a few miles my toes still ended up moving forward till I they hit the front of the shoe. This probably has to do with the fact that I only lace my shoes tight enough to lock in my heel.
If you like your shoes laced up tight this probably will not be an issue.
The price point for the Altra Impulse is $120 dollars, which while competitive in the market place it still is a little expensive. In this day and age where people are scrounging for liquidity, I really would like to see at least one company come out with a quality shoe that retails for under $80. Of course that is my opinion and my opinion only.
How did the Altra Impulse Rate?
Quality – 4/5
Upper – 5/5
Outsole – 5/5
Flexibility – 4/5
Comfort –5/5
Appearance – 4/5
Cost – 3/5
Overall – 4.2/5
Have you ever run in an Altra Running Shoe?
What were your experiences?
Which model do you like best?
Carpe Vitam!
(Seize Life!)