I don't think I am special in sizing. I use US 10.5 in Asics, and 11 in any Altra. I have Superior, Provision, The One and Torin, all in size 11. When I got the One2 in 11 the toebox seems tighter (height) and my big toes got blisters. Does anyone have experience with One2 sizing compared to e.g. the original The One. Btw. this is a completely different shoe and more like a Kinvara with a wide toebox. Super light shoe, but I am sticking with the original The One for speed work.