The KARHU Fusion 4.0 running shoes offer a perfect blend of cushioning and propulsion, making them an excellent neutral running shoe for tempo runs, training sessions, and workouts. Designed with comfort and performance in mind, the KARHU Fusion 4.0 ensures a smooth ride for runners who prefer balanced support without added stability features. For those in need of extra space, the Fusion is also available in a wider fit called HiVo.