The Kinvara 12 is influenced by the highly successful Saucony Endorphin collection. The upper has been "stripped" to create the sleek look it now has. The mesh material provides exceptional breathability and comfortably fits around the feet without being too rigid, all thanks to Formfit technology. The material is more durable and now withstands even better. The heel stays in place during all your races to ensure a safe and stable driving experience. The Form 2u insole molds to your feet. The Pwrrun midsole returns a lot of energy with every step you take. This gives a responsive feel while the pressure is distributed in the feet.