If you have made the transition to zero drop or are currently running in a low ratio shoe this Mizuno race/trainer is for you.
The upper is supremely comfortable. It is just like wearing a sock.
My only issue is the lace arrangement but it is a minor quibble.
I found them a little on the large side, maybe half a size, that being said I'm still comfortable in these @ a US 9.5 they are 177grams (6.24oz)
If you are fairly efficient with a sub 3 pace you will enjoy these.
The alternative is the Cursoris although I haven't tried them I would be fairly sure they would have similar qualities.