Stance phase of running and as slipping as early as 50% into the stance Surfaces and that the majority of differences were seen 80% into the Was a significant difference on friction coefficient between different Outsole pattern with different materials to compare the relationship ofįriction coefficient and ground reaction force. Moriyasu, Nishiwaki, Yamaguchi, & Hokkirigawa (2012) looked at There is still some inherent instability with the soft and bouncy nature of the midsole, however the integration of sidewalls, sole flaring, and improved geometry seem to work well with the platform and my mechanics. The heel may have a little more room than I'd like, but locking the shoe down a little tighter seems to do the trick. For being a newer generation raising shoe, the stability of this model has actually done quite well. The new Atomknit 2 seems to have slightly more continuous fibers that does not stretch quite as easily. The shoe added a little bit more ZoomX foam above the air pod and streamlined the sidewalls through the midfoot. The results in a much more secure feeling when transitioning from the heel through the toe. The upper also seems to have some improvements with stability as well. The forefoot has also been widened and extended proximally to become more continuous with the midfoot. I think the Alphafly Next% 2 made some good improvements in the stability category. The shoe utilizes geometry and sidewalls in a more efficient fashion than the previous version. The ride ultimately feels more balanced throughout, though loses some top speed responsiveness. The pods are still noticeable and the forefoot bounce is still evident, though the rolling sensation is slightly more pronounced in this version. This is easily a marathon option and potentially a good half marathon shoe as well. The Alphafly 2 feels like it lost some top speed for me, but the shoe is even better at rhythmic pacing. This did come with a weight gain to an already heavy racing shoe. The shoe feels a little more put together and less decoupled. The pods did not feel quite as abrupt and the midfoot transition felt smoother thanks to the sidewalls. The forefoot widened slightly and the shoe has a little bit more ZoomX midsole at the air pod. The biggest thing I noticed was that the shoe felt much better at rhythmic paces to me in Version 2. The shoe gained a little bit of weight, but maintained much of the same DNA. The Alphafly 2 was an interesting experience. Overall, the dimensions are done pretty well and the added sidewalls with midfoot widening on the platform makes for a more comfortable midfoot than the previous version too. The shoe did have some heel slippage initially, but when locked down the slippage minimizes quite a bit. The heel is curved backwards to allow some room for the Achilles and has some padding at the top to prevent irritation. The heel and midfoot are normal width with the forefoot being normal to slightly wide. The material also feels a little less synthetic and plastic like compared to Atomknit 1.
The upper feels like it has a little more natural reinforcement in the new model with the fibers being a little tighter woven and more resilient to stretch.
The mesh upper fits to the foot pretty well and has some decent resemblance of the first model.
The Alphafly Next% 2 utilizes Atomknit 2 as the material for the upper. The Alphafly Next% 2 is a racing shoe with some decent stability elements that can easily tackle a marathon and half marathon. The shoe is still a racing shoe, but feels a little less "fast" and more of a shoe that is rhythmic that you can have on your feet for a long time. The shoe still provides a sense of bounciness and responsiveness, though with a little more structure underfoot. My pair, Men's 9.5, weighs 8.4 ounces, which is heavier from 8.1 ounces in my originals. The Alphafly Next% 2 is a top shelf racing option that leans towards the longer distances.
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