The 4 in Fusion4 represents the four ways in which the foot individually finds its fit: upwards, to the sides, diagonally and downwards. Superior fit is achieved through a dynamically flexible HiFlex Upper that stretches in all the right places and a Dynergy Sole that varies in the way it yields to pressure and motion in the forefoot and heel. The result is superb comfort without fatigue.
The waterproof, breathable and highly durable GORE-TEX® membrane has been specially engineered to ensure dry feet and optimal comfort in any type of weather. Maximum heat transfer and outstanding moisture management ensure a perfect foot climate, even in extreme conditions.
Easily removed insole allows for insertion of custom orthotic device.
Proprietary responsive sole that dynamically reacts to pressure for instant foot support.