Smooth and flexible is how you will experience running in the Fierce. This running shoe features a wider base platform from heel to toe, providing a stable ride. On top of that we put a full length Quikspring+ layer which delivers cushioning and comfort, together with the Ortholite insole. Together, these 3 layers provide a really smooth and natural running experience. The upper of the Fierce is made from a flexible and breathable engineered knit, supported by the soft and comfortable pressure free tongue.