A hollow body golf club head comprising: a front body portion; the front body portion having: a face comprising: a striking surface comprising an outer edge, where the outer edge defines a perimeter of the striking surface; a back surface opposite the striking surface; a geometric center; a thickness measured from the striking surface to the back surface; a perimeter region comprising a constant perimeter thickness and extending inward from the outer edge of the face toward a perimeter boundary, where the perimeter boundary defines the locations on the face where the thickness of the face deviates from the constant perimeter thickness; a transition region comprising a varying transition thickness and extending inward from the perimeter boundary toward a transition boundary, where the transition boundary defines the locations on the face where the thickness of the face deviates from the varying transition thickness; an intermediate region comprising a constant intermediate thickness and extending inward from the transition boundary toward an intermediate boundary, where the intermediate boundary defines the locations on the face where the thickness of the face deviates from the constant intermediate thickness; wherein: the intermediate thickness comprises a minimum thickness of the face; the perimeter thickness is greater than the intermediate thickness; a perimeter distance measured from the outer edge of the striking surface to the perimeter boundary is less than or equal to 0.635 cm (0.25 inch); the perimeter region further comprises a junction, where a junction distance measured from the outer edge of the striking surface to the junction is less than the perimeter distance, where the thickness of the face is constant on both sides of the junction. a striking surface comprising an outer edge, where the outer edge defines a perimeter of the striking surface; a back surface opposite the striking surface; a geometric center; a thickness measured from the striking surface to the back surface; a perimeter region comprising a constant perimeter thickness and extending inward from the outer edge of the face toward a perimeter boundary, where the perimeter boundary defines the locations on the face where the thickness of the face deviates from the constant perimeter thickness; a transition region comprising a varying transition thickness and extending inward from the perimeter boundary toward a transition boundary, where the transition boundary defines the locations on the face where the thickness of the face deviates from the varying transition thickness; an intermediate region comprising a constant intermediate thickness and extending inward from the transition boundary toward an intermediate boundary, where the intermediate boundary defines the locations on the face where the thickness of the face deviates from the constant intermediate thickness; wherein: the intermediate thickness comprises a minimum thickness of the face; the perimeter thickness is greater than the intermediate thickness; a perimeter distance measured from the outer edge of the striking surface to the perimeter boundary is less than or equal to 0.635 cm (0.25 inch); the perimeter region further comprises a junction, where a junction distance measured from the outer edge of the striking surface to the junction is less than the perimeter distance, where the thickness of the face is constant on both sides of the junction. the intermediate thickness comprises a minimum thickness of the face; the perimeter thickness is greater than the intermediate thickness; a perimeter distance measured from the outer edge of the striking surface to the perimeter boundary is less than or equal to 0.635 cm (0.25 inch); the perimeter region further comprises a junction, where a junction distance measured from the outer edge of the striking surface to the junction is less than the perimeter distance, where the thickness of the face is constant on both sides of the junction.