The biggest update here is that the flywire on the laces now goes back towards the heel, rather than straight down to improve the flexible wrap over the midfoot. A slightly looser weave of the flyknit towards the toe box makes it feel roomier than last year and help it fit more true-to-size. A lighter compound was used to make the lunarlon sole even lighter. Built for speed without sacrificing stack-height. A nice high mileage performance trainer.