Is a shoe made for the porpuse, in other brand I use 10.5 M, with with Altra it feels like i should use an 11 because the toe box is shallower than my other traditional shoes my toes are in contact with the shoe under and over the toe box, also my toes are closer to the front edge. I give it a try to the 10.5 and walked 5 miles feeling good then ran for 4 miles feeling OK, it is the first time i use a zero drop plattaform shoe, it does feels different but I was able to run my regular length. My previous shoe is a ASICS Gel-Cumulus 16, which I love and still use.  ASICS it has a bigger and better support for the arc very reason i choose them among other brand and models. I want to buy the ALTRA Torin 2.0 because they look more cuchioned than the ALTRA One 2.<br />At this time I will keep the ONE 2 for the 5k and 10k runs, still will train with ASICS for now while I do the transicion to this new plattaform, possibly will get the Torin 2.0 to help the change.<br />Pictures are same size shoe, look the difference.<br />4 stars for now, I hope to change it to a 5 later.