A neutral trainer, the Fluid is for runners who have sound biomechanics and prefer additional cushioning features. Featuring Karhu's patented Neutral Fulcrum technology, the Fluid provides a natural rolling effect from heel-to-toe, while enhancing the overall ride and feel of the running experience

Upper: Breathable air mesh with a synthetic mud guard provides durability and support. Padded mesh tongue and heel collar for increased breathability and comfort. Internal heel counter sets up the foot for a smooth transition.

Midsole: Precision engineered three part molded EVA with tuned durometers provide a responsive ride ensures a quick transition for the runner seeking a highly responsive, yet comfortable, cushioned midsole. The asymmetrically designed Fulcrum is moderately firm with a durometer of 62. EVA around the fulcrum has a durometer of 57. An injection molded shank provides arch support. A removable high performance polyurethane Ortholite sockliner provides excellent moisture management and durable cushion with a great step in feel. Low density EVA forefoot insert in an hourglass shape provides anatomically correct forefoot cushioning during the propulsion phase. Fulcrum Technology turns energy and pressure into forward momentum. Through the three phases of the gait cycle, the Fulcrum is designed to convert energy and pressure into forward momentum by transitioning the foot from heel to toe quickly and efficiently while the body stays balanced throughout the stride. Fulcrum reduces wasted vertical forces, speeding up the time the heel is on the ground. It provides a natural ride throughout the gait cycle promoting the foot's natural abilities. The foot follows the path of least resistance so large shifts of pressure to the outer and inner edges do not occur. During heel strike, the platform, extending back from the Fulcrum points, absorbs the force of heel strike loading the Fulcrum with energy. During the gait cycle, the center of pressure is balanced as it travels from the landing platform through the Fulcrum points, creating a natural path for the foot. The asymmetrical Fulcrum points allow for balanced heel strike and create the transition from the braking phase to the propulsion phase. Lightweight, low profile Fulcrum has been engineered for maximum momentum. California slip lasted for stability and comfort. The upper is stitched around an EVA board and directly attached to the midsole.

Outsole: High abrasion carbon rubber with anatomic flex grooves ensures flexibility, traction, durability and protection from the road.

Available in width D (Medium).