Golf club head with flexure

A golf club head, comprising:

• a crown defining an upper surface of the golf club head;
• a sole defining a lower surface of the golf club head, comprising a transmittal portion, a flexure and a rear portion;
• a side wall extending between the crown and the sole;
• a hosel extending from the crown and including a shaft bore;
• and
• a face defining a ball-striking surface and intersecting the transmittal portion at a leading edge,
• wherein the flexure is spaced aftward of the ball-striking surface by the transmittal portion, and comprises a front wall, an apex and a rear wall, wherein the front wall extends into a cavity defined by the golf club head and the rear wall extends into the cavity and the front wall and the rear wall are coupled at the apex,
• wherein the thickness of the apex is different from the greater of the thickness of the front wall and the thickness of the rear wall by less than 30%,
• wherein the face comprises an outer layer forming a portion of the ball striking surface, a back layer and a chip insert, and the outer layer and back layer are coupled and define an enclosed cavity and the chip insert is disposed in the enclosed cavity, and
• wherein the face has a Face Thickness Ratio of less than about 0.875, wherein the Face Thickness Ratio is defined as a thickness of the outer layer at the geometric face center divided by a thickness of the backing layer at the geometric face center.

A golf club head, comprising:

• a crown defining an upper surface of the golf club head;
• a sole defining a lower surface of the golf club head, comprising a transmittal portion, a flexure and a rear portion;
• a side wall extending between the crown and the sole;
• a hosel extending from the crown and including a shaft bore;
• and
• a face defining a ball-striking surface and intersecting the transmittal portion at a leading edge,
• wherein the flexure is spaced aftward of the ball-striking surface by the transmittal portion, and comprises a front wall, an apex and a rear wall, wherein the front wall extends into a cavity defined by the golf club head and the rear wall extends into the cavity and the front wall and the rear wall are coupled at the apex,
• wherein a thickness of the sole rearward and immediately adjacent the rear wall of the flexure is less than 70% of the minimum thickness of the transmittal portion,
• wherein the face comprises an outer layer forming a portion of the ball striking surface, a back layer and a chip insert, and the outer layer and back layer are coupled and define an enclosed cavity and the chip insert is disposed in the enclosed cavity, and
• wherein the face has a Face Thickness Ratio of less than about 0.875, wherein the Face Thickness Ratio is defined as a thickness of the outer layer at the geometric face center divided by a thickness of the backing layer at the geometric face center.