I have detailed a few ways of loosening the flyknit in my modification thread in the sneaker art subform. Most reviewers have said the flyknit does loosen with time. However, for people who have larger feet, orthotics, or who did not size up a half size, there is a quick mod if you are brave enough to modify a $150 sneaker. There is a rubber strap between the lacing and heel cup on the inside of the shoe - this is the backing to the outer swoosh. If you cut and or remove this strap, the shoe slips on much more easily and the flyknit has more room to stretch out. If you are really brave, you can remove all the reinforcement backing from the heel cup, behind the swoosh, and all the way up to the back of the laces. This panel really constrains the flyknit and keeps it from stretching like knit material should. I made this mod to a new pair of black/black Epics and after several days of wear and 5K runs, they feel fantastic. This one mod completely changes the character of the shoe, from hard to get on and too snug in the forefoot, to easy to get on and feeling like wearing a comfortable knit sock. However, I'd understand if owners are hesitant to start hacking on a new pair of expensive sneakers. I basically ruined my first pair of black/grey Epics through too much experimenting.
