Nike LunarEpic Low Flyknit

Nike LunarEpic Flyknit Review

Nike's press release for the Lunarepic headlines the shoe as follows:

Featuring a revolutionary mid-height collar design and a new tooling system, the Lunarepic Flyknit offers a virtually vanishing fit, fluid feel and superior softness.

By and large I agree with the headline. The Lunarepic is one of the most innovative shoes I have seen in a long time and a very well executed collection of new concepts. As a runner who experienced Nike's earliest innovations back in the 70's as a high school aged wear tester when their original R&D was in my home town, I am excited Nike is back on a serious innovation train.
The Lunarepic is a Concept Shoe that is practical, different, and most importantly a fabulous ride.
They are described by Running Warehouse, where I got mine, as weighing 7.8 oz/ 221 g size 9 men's, 6.6 oz/ g women's with a 28mm heel 18 mm forefoot, 10mm drop. At $175 the price is in the stratosphere. I bought my Lunarepic at retail.

Here is how those headlines play out.

  • The combination of the mid-height collar as part of a 100% Flyknit upper truly makes the foot as one with the platform below
  • The co-molded "new tooling system", no glue to join outsole midsole has an incredibly smooth and consistent feeling from heel letdown to flexible toe off
  • Part of the tooling, the no rubber outsole, which is really the ground and sidewall layer of the midsole, has deeply siped (scored) pods deform for a subtle, smooth ground conforming piston like effect on landing and takeoff, the fluid feel.
  • It's not exactly a soft shoe but it does have the unique and very pleasant "superior softness", one with no sense of either bottoming out the cushioning or sinking to far without rebound.
From heel to toe, upper to midsole/outsole the on the run feeling is one of seamless unity between foot and shoe.
Upper and Fit

Lunar Epic

While Nike's Flyknit is not new, in the Lunarepic it is taken to new "heights" with a middle ankle collar integral to the rest of the knit upper. Reminds me of the very effective collar in the earlier 2014 adidas XT Boost road/trail hybrid shoe (review here), Nike claims the "mid-height collar was added to facilitate lockdown, both physically and sensorially... ". Absolutely the case for me. There is no gap in the perceived or actual relationship between foot and shoe at the heel.

The functional variations in knit densities is incredibly detailed.

What would I do differently with the upper? The heel "counter is a bonded overlay. I think it could be slightly more substantial and maybe higher for those who land unevenly on the heel. I felt a bit of instability at the far back of the heel.
The collar itself is lined with green stretch fabric. The only sewn piece in the shoe, a lumpy feeling black strip at the heel and another inside joining the two sides was somewhat irritating in other than higher socks, right where the heel counter ends and at the top. Not sure why this fabric join piece is not more flexible, understanding that some substance and stitching is in order there to hold the shoe together when sliding it on.

Nike Lunarepic Flyknit Overhead Toe Box View

The mid foot is superbly well held by the Flywire cords. They are easy to lace to the right pressure, always an issue for me. In fact only a light lacing was required in my true to size pair. I tried the included thicker insole and found the fit to snug. Sizing down a half size and I worry I would run out of toe room in the somewhat pointy toe box. Nothing about the toe box was an issue. Midsole and Outsole
These two words are interchangeable in the case of the Lunarepic.

Here is now Nike describes the construction:

"Moving to the midsole, the designers employed a new dual-injection technology. Using heat, instead of glue, they fused two foams into one piece that still features traditional Lunarlon construction, with an IU foam carrier and soft IP core."

Eliminating the glue not only eliminates waste and weight but also creates a more seamless feel under foot between materials. The firmness of the two materials appears fairly closely matched with the outsole only slightly firmer. Soft midsole materials used as outsoles such as RMAT in the recently reviewed Hoka Clayton have a tendency to scuff/abrade wear. With 20 miles or so of road running often on winter road sand remnants no unusual wear observed so far. I am not expecting the outsole to outlast more conventional rubber but we'll see...


Most significantly the Lunarepic outsole incorporates what Nike describes as follows:

a rubber-free outsole with laser-siped geometric pistons inspired by pressure maps of the foot was added. Constructed of Lunarlon foam, each piston moves individually, enabling pointed compression that results in an exceptional ride. Maximizing both cushioning and traction, it provides unrivaled heel-to-toe transitions and propelling energy return.

Another big mouthful! Well again another effective innovation. There is a definite subtle sense of foot meeting road on top of mounded pistons, a gradual smooth compression and then release. It's not a noticeable piston as in a Newton or a single surface deflecting down as in the Altra Impulse. It is more noticeable in the forefoot where pressures are lighter than the heel. In the heel essentially its a single large piston. The pods are essentially a full outsole coverage particularly in the forefoot and feel like they adapt to my foot pressures at various stages of my gait. The sipes also provide great traction on wet pavement, boat shoe often have such cuts in the outsole. I tried running the always slick white paint lines in a rain storm and the grip was fine.

Nike Lunarepic Flyknit Flexing the Outsole

The sipes or cuts into the pods definitely play a big role in this unique feel. They contribute to the smoothness of the ride and considerable flexibility of the shoe. As they are mostly longitudinal they keep the shoe relatively stiff laterally for an element of stability. They also provide great traction.

As others, such as Thomas at Believe in the Run, said in his fine review the sipe cuts do accumulate small road grit but no bigger pieces have jammed in so far with potential for tearing. Not sure I would take them trail running but at some point will have to try. Might be quite good if the outsole does not get ripped to shreds on rocks. Not noticeable when running, removing the grit makes for some dental tool "flossing" after runs!


Sketches illustrating design principles and construction.

Well a good part of the midsole is actually the outsole as well. The white Lunarlon is a carrier for the green softer inner core. The idea is that the outer shell stabilizes and the inner core cushions. Again I found this approach highly effective on the run.

On the lateral side the midsole is wiped to provide a longer compression to aid toe off.

Nike Lunarepic Flyknit Lateral Side

On the medial side the sipes are shorter to retain some stability

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Which is better for long distance, the Nike Flyknit Racer or the Free Runs? - Quora

With the acknowledgement that the Free's have less support and more flexibility than the average shoe. So, you would need to have a base of training built on using them beforehand. These kinds of shoes work your feet and calves much more- which in many respects can be a good thing. But yes- the idea behind them is that their designed to let your body run more naturally, and supposedly better for long distances, using a form that's less pounding on the body.

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