The Kinvara 12 has been influenced by the highly successful Saucony Endorphin collection. The upper part has been "stripped down" to create the fast look they now have. The mesh material provides excellent breathability and fits comfortably around the feet without becoming too stiff, all thanks to Formfit technology. The material is more durable and now withstands even better. The heel is kept in place in all your races to ensure a safe and stable driving experience. The Form 2 u 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 across the feet.