Returning in its most natural form is the 33-DFA™ shoe, which has been enhanced with a new Seamless Construction upper to deliver an improved fit with greater breathability. Staying true to the most critical element of the shoe is the Natural33™ Last, which mimics the shape of the foot and allows for a secure heel fit. Weight: 7.5 oz. Heel Height: 13mm. Forefoot Height: 9mm.