Compared to my Addizero shoes from 5 years ago these appear to be made from less material, the sole that touches the ground  is just one piece vs two for the old shoe. Like a lot of manufactured items (cars too) they've cut cost by using less, cheaper material. Not that this is bad shoe it just seems to have a lot less components than my old shoe, perhaps I'm not comparing apples to oranges here. The shoe does not seem to flex as well as the old shoe, how can it as it is one piece of material on the bottom.<br /><br />Also the sell failed to mention that the old adage of Adidas running 1/2 a size too small is not longer true. We all like to save a buck but you know a good old running shop were one can actual look and feel the show may be better in this case. And my experience with Amazon is similar to this too, great price but sub par buying experience, customer service etc - there is no free lunch I guess :)