Gear Review: Brooks PureGrit Trail Running Shoe – Part 1…

Instead of patiently waiting until I’ve been able to put some miles on these shoes to fully field test them before starting my review, I will be breaking the review up into 3 parts.  The first part will focus on the technology behind the shoe and what the manufacturers profess about it’s design and construction as well my personally first impressions of the shoe.  The second part will describe the actual time, mileage and conditions of the field testing and summarize the shoe’s performance.  The third part will layout my final conclusions and pit the actual performance against the manufacturer’s claims.  So, without further adieu…

PureProject – PureGrit Trail Runner

Part 1

Specifications

  • Midsole Height:  Heel (15 mm), Forefoot (11 mm)
  • Outsole Height:  Heel (3 mm), Forefoot (3 mm)
  • Heel-to-Toe Offset:  4 mm
  • Tooling Height:  Heel (18 mm), Forefoot (14 mm)
  • Weight:  8.9 oz (M’s) / 7.6 oz (W’s)
  • Surface: Offroad/Trail
  • Pronation: None/Normal, Mild, Moderate
  • Build: Small, Medium, Large
  • Competition: Trail racing
  • Arch: Flat, Medium, High
  • Performance: Light Weight
  • Category: Trail
Technologies

Design

Brooks designers worked with ultramarathoner Scott Jurek, to develope a unique one-piece outsole that has a concave shape. According to their website, “When forces are applied, the piece splays out to provide a more balanced lay-down.” This dynamic outsole and unique lug design are intended to help the runner find better grip and balance on the trail.  Also built-in to the new outsole is a split toe design meant to allow independent function of the big toe for more natural balance and stronger push-off.  Brooks also boasts their outsole is, “Designed from the most detailed anatomical form…” which is intended to create unparalleled fit and feel.

The PureProject midsole offers a minimal 4mm drop and made of  “earth-loving BioMoGo technology blended with the responsive ride of Brooks® DNA”.  BioMoGo technology is brooks biodegradable midsole composite that “degrades 50 times faster than the standard midsole“.  Brooks DNA is a responsive midsole system that immediately adjusts to the runner’s size and stride as well as offering 30% more cushioning than standard midsoles and 2x the energy return.  Built into the midsole design is a new minimalist heel designed to encourage the runner’s, “contact points to shift forward, aligning your center of gravity for optimal spring.”

The PureGrit upper has had just as much thought put into its design as the rest of the shoe.  The upper is made of an ultralight, breathable mesh over a die-cut conforming foam for a firm fit.  Their Nav Band is an elastic band built into the upper that stretches across the instep to insure a glove-like fit and security while you run.

As for durability, Brooks says, “Just like our core line, we hold PureProject to the industry’s highest weartest and durability standards. Because of their lightweight construction and fewer materials, runners should generally expect shoes from the PureProject line to last approximately 250-300 miles.

First Impressions

These shoes are incredibly light.  This is the closest thing to a minimalist running shoe I’ve tried on.  Brooks did a great job in material selection here, even thought they are lightweight they don’t feel weak.  So many lightweight shoes feel as though structure was sacrificed to lose the extra ounces which just won’t cut it in a trail runner.  The outsole feels like it would chew up the trail, but the soft midsole seems like it might not take the abuse so well.  Especially out here in Arizona where the trail comes at you from all sides.

I have not felt any significant difference in my run experience due to the toe split or the concave outsole, but in all honesty I have not had them on the trail yet.  I’ve had them out for a couple of short jogs around the streets here and they feel very comfortable with really no break-in period.  I have very high arches and typically have to spend some time breaking in new shoes so that they don’t kill the tops of my feet.  My PureGrits were immediately comfortable and after a couple of short runs I did not feel any pain, fatigue or hot-spots related to my arches.

I am, after only a few miles on these, feeling fatigue in my ankles.  My assumption is that the design of these shoes is doing something to alter my natural stride and alignment (hopefully correcting it!) and it’s causing some fatigue as my ankles adjust.

In short, I am impressed so far and can’t wait to get them on the trail.  Look for Part 2 – the Trail Test coming soon…

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