The Achilles' Heel: Great Flyknit, Fierce Studs, Fatal Insole
Danear
The reinforced studs on the new outsole are extremely aggressive, and the Flyknit upper provides a very comfortable, snug fit. However, the insole is a huge letdown. The heel section is way too thin, leaving too much empty space in the heel area, which causes noticeable heel slippage when running. Swapping it out for a different insole significantly fixes the problem.






