I first read about Ultra Boost through my friend Frederic Brossard, a mighty fine blogger over at runners.fr. I attempted to translate his impressions from the original French here.
The Ultra Boost features:
- adidas Boost material, 30% more of it in the midsole and no firmer EVA layer at the toe and as stabilizing ring around the outer perimeter just above the insole as in other Boost runners such as the Adios Boost and Energy Boost,
- an innovative incredible comfortable single piece and stretchy PrimeKnit upper, some will be able to run without laces,
- instead of a full heel cup, two plastic heel wings leaving the achilles supported but not pressured,
- a new outsole, the Stretch Web a soft conforming layer on the road,
- The Boost stabilizing Torsion plastic is embedded in the midsole instead of placed just under the outsole under the midfoot and there is none in front to support the forefoot as in other Boost shoes such as Adios Boost, Boston Boost, and Energy Boost.
- considerably more flexible than the Energy Boost without the distinctive snap flex.
- less responsive than Energy Boost, my go to marathon race shoe (review here) or Adios Boost my 2014 Shoe of the Year (review here), or the well cushioned and smooth New Balance Fresh Foam Boracay (review here).