The details are what set the Cloud X apart. Dual-density sockliner, seamless shoe tongue, and new-generation inner materials set a new bar for comfort that can`t easily be seen - but definitely will be felt. The performance upper of the Cloud X uses an engineered mesh of the highest quality and material strength. Light and breathable in all the right places, it supports you without suffocating your foot`s freedom of movement. Lean, engineered heel cap with second-to-none precision-molded cushioning pad technology keeps you stable without strain. Or more simply put: slip your heel into the Cloud X to have it stay comfortably in place.