Golf club

1. A golf club head comprising:

a club head body having a crown, a sole, a heel, and a toe;

a face portion connected to a front end of the club head body, the face portion including a geometric center defining an origin of a coordinate system when the golf club head is in a normal address position; and

a face-to-crown transition where the face connects to the crown near the front end of the club head body,

wherein the coordinate system includes:

an x-axis being tangent to the face portion at the origin and parallel to a ground plane,

a y-axis intersecting the origin being parallel to the ground plane and orthogonal to the x-axis, and

a z-axis intersecting the origin being orthogonal to both the x-axis and the y-axis;

the golf club head defining a center of gravity (CG), the CG being a distance CG y from the origin as measured along the y-axis and a distance CG z from the origin as measured along the z-axis;

wherein in a y-z plane passing through the origin the crown height continuously increases starting from the face-to-crown transition up to a local maximum;

wherein a CG effectiveness product (CG eff ) for the golf club head is defined as CG eff =CG y ×Δ z and the CG eff is at least 806 mm 2 ; and

wherein the golf club head further comprises a sole feature, the sole feature comprising an extended platform formed in the sole, the extended platform extending rearwardly from a first end to a second end, and further comprising:

a planar sole surface and opposed sloped portions that, when the golf club head is in a normal address position, slope away from the ground plane toward the crown, the opposed sloped portions comprising a sloped heel side portion positioned heelward of the planar sole surface and a sloped toe side portion positioned toeward of the planar sole surface;

a forward portion adjacent the first end; and

a rearward portion adjacent the second end,

wherein the extended platform has a first center point positioned at the first end and a second center point positioned at the second end, and

wherein the second center point is positioned toeward of the first center point and toeward of the y-axis.

2. The golf club head of claim 1 , wherein the golf club head has a crown height to face height ratio of at least 1.12.

3. The golf club head of claim 1 , wherein in a y-z plane passing through the origin at a distance CG y from the origin, the crown height is greater than the face height.

4. The golf club head of claim 1 , wherein in a y-z plane passing through the origin a rearmost portion of a trailing edge of the golf club head is lower than the origin.

5. The golf club head of claim 1 , wherein the CG eff is no more than 1031 mm 2 .

6. The golf club head of claim 1 , wherein the extended platform extends rearwardly at an angle along a flow direction from the first end to the second end.

7. The golf club head of claim 6 , wherein the angle of the flow direction from the first center point to the second center point relative to the y-axis is at least 11 degrees.

8. The golf club head of claim 6 , wherein the angle of the flow direction from the first center point to the second center point relative to the y-axis is at least 9 degrees.

9. The golf club head of claim 6 , wherein the extended platform has a length extending between the first end and the second end, and a width that is normal to the length, and further wherein the width measured at a plurality of locations along the length is approximately constant.

10. The golf club head of claim 1 , further comprising at least one first mass element connected to the club head body of the golf club head forward of the extended platform.

11. The golf club head of claim 10 , further comprising at least one second mass element connected to the extended platform.

12. The golf club head of claim 11 , wherein the second mass element is positioned in the rearward portion of the extended platform.

13. The golf club head of claim 1 , further comprising at least one mass element connected to the extended platform.

14. The golf club head of claim 13 , wherein the at least one mass element is positioned in the rearward portion of the extended platform.

15. The golf club head of claim 1 , further comprising an adjustable head-shaft connection assembly coupled to the club head body and operable to adjust at least one of a loft angle or a lie angle of a golf club formed when the golf club head is attached to a golf club shaft via the head-shaft connection assembly.

16. The golf club head of claim 15 , further comprising:

a heel opening located on the heel end of the club head body, the heel opening configured to receive a shaft fastening member; and

a sleeve that is secured by the shaft fastening member in a locked position to secure the adjustable head-shaft connection assembly.

17. The golf club head of claim 1 , wherein the face portion comprises a composite face plate.

18. A golf club head comprising:

a club head body having a crown, a sole, a heel, and a toe;

a face portion connected to a front end of the club head body, the face portion including a geometric center defining an origin of a coordinate system when the golf club head is in a normal address position; and

a face-to-crown transition where the face connects to the crown near the front end of the club head body,

wherein the coordinate system includes:

an x-axis being tangent to the face portion at the origin and parallel to a ground plane,

a y-axis intersecting the origin being parallel to the ground plane and orthogonal to the x-axis, and

a z-axis intersecting the origin being orthogonal to both the x-axis and the y-axis;

the golf club head defining a center of gravity (CG), the CG being a distance CG y from the origin as measured along the y-axis and a distance CG z from the origin as measured along the z-axis;

wherein in a y-z plane passing through the origin the crown height continuously increases starting from the face-to-crown transition up to a local maximum;

wherein a CG effectiveness product (CG eff ) for the golf club head is defined as CG eff =CG y ×Δ z and the CG eff is at least 806 mm 2 ; and

wherein the golf club head further comprises a sole feature, the sole feature comprising an extended platform formed in the sole, the extended platform extending rearwardly and angled toewardly from a first end to a second end, and further comprising:

a planar sole surface and opposed sloped portions that, when the golf club head is in a normal address position, slope away from the ground plane toward the crown, the opposed sloped portions comprising a sloped heel side portion positioned heelward of the planar sole surface and a sloped toe side portion positioned toeward of the planar sole surface;

a forward portion adjacent the first end having a first center point; and

a rearward portion adjacent the second end having a second center point,

wherein the second center point is positioned toeward of the first center point.

19. The golf club head of claim 18 , wherein in a y-z plane passing through the origin at a distance CG y from the origin, the crown height is greater than the face height.

20. The golf club head of claim 18 , wherein the CG eff is no more than 1031 mm 2 .

21. The golf club head of claim 18 , wherein in a y-z plane passing through the origin a rearmost portion of a trailing edge of the golf club head is lower than the origin.

22. The golf club head of claim 18 , further comprising at least one first mass element connected to the extended platform.

23. The golf club head of claim 22 , wherein the first mass element is positioned in the rearward portion of the extended platform.

24. The golf club head of claim 23 , further comprising a second mass element connected to the club head body forward of the extended platform.

25. The golf club head of claim 22 , wherein the face portion comprises a composite face plate.

26. The golf club head of claim 22 , further comprising an adjustable head-shaft connection assembly coupled to the club head body and operable to adjust at least one of a loft angle or a lie angle of a golf club formed when the golf club head is attached to a golf club shaft via the head-shaft connection assembly.

27. The golf club head of claim 18 , wherein the extended platform extends rearwardly at an angle along a flow direction from the first end to the second end, and wherein the angle of the flow direction from the first center point to the second center point relative to the y-axis is at least 9 degrees.

28. A golf club head comprising:

a club head body having a crown, a sole, a heel, and a toe;

a face portion connected to a front end of the club head body, the face portion including a geometric center defining an origin of a coordinate system when the golf club head is in a normal address position; and

a face-to-crown transition where the face connects to the crown near the front end of the club head body,

wherein the coordinate system includes:

an x-axis being tangent to the face portion at the origin and parallel to a ground plane,

a y-axis intersecting the origin being parallel to the ground plane and orthogonal to the x-axis, and

a z-axis intersecting the origin being orthogonal to both the x-axis and the y-axis;

the golf club head defining a center of gravity (CG), the CG being a distance CG y from the origin as measured along the y-axis and a distance CG z from the origin as measured along the z-axis;

wherein in a y-z plane passing through the origin the crown height continuously increases starting from the face-to-crown transition up to a local maximum;

wherein a CG effectiveness product (CG eff ) for the golf club head is defined as CG eff =CG y ×Δ z and the CG eff is at least 806 mm 2 and no more than 1031 mm 2 ; and

wherein the golf club head further comprises a sole feature, the sole feature comprising an extended platform formed in the sole, the extended platform extending rearwardly from a first end to a second end, and further comprising:

a planar sole surface and opposed sloped portions that, when the golf club head is in a normal address position, slope away from the ground plane toward the crown, the opposed sloped portions comprising a sloped heel side portion positioned heelward of the planar sole surface and a sloped toe side portion positioned toeward of the planar sole surface;

a forward portion adjacent the first end; and

a rearward portion adjacent the second end;

wherein the extended platform has a first center point positioned at the first end and a second center point positioned at the second end and wherein the second center point is positioned toeward of the y-axis and toeward of the first center point.

29. The golf club head of claim 28 , further comprising at least one first mass element connected to the extended platform.

30. The golf club head of claim 28 , wherein the extended platform extends rearwardly at an angle along a flow direction from the first end to the second end, and wherein the angle of the flow direction from the first center point to the second center point relative to the y-axis is at least 9 degrees.