Karhu Men's Fluid Fulcrum Ride Running Shoe 100% Mesh For runners who have sound biomechanics and prefer additional cushioning features -- the Fluid fulcrum_ride provides a natural rolling effect from heel-to-toe, while enhancing the overall ride and feel of the running experience Breathable, allows for an adjustable heel fit, lightweight for toe off durability, promotes the natural abilities of the foot, provides anatomically correct forefoot cushioning, for excellent moisture management and durability, ensures traction