Golf club heads

1. A wood-type golf club head comprising:

a body having front end, a rear end, a top side, a lower side, a toe side, a heel side, and a hosel positioned at the heel side of the body, a sole positioned at the lower side of the body, and a crown positioned at the top side of the body, the golf club head having a volume of from about 350 cm 3 to about 600 cm 3 and an interior cavity;

an adjustable head-shaft connection assembly coupled to the hosel and configured to adjust an orientation of the golf club head relative to a golf club shaft; and

a face positioned at the front end of the golf club head and including a striking surface, the striking surface having a club head origin positioned at a geometric center of the striking surface, the club head origin defining a head origin coordinate system including a z-axis extending through the head origin in a generally vertical direction relative to a ground plane when the golf club head is in a normal address position; an x-axis extending through the head origin in a toe-to-heel direction generally parallel to the striking surface and generally perpendicular to the z-axis; and a y-axis extending through the head origin in a front-to-back direction and generally perpendicular to the x-axis and to the z-axis;

wherein the x-axis extends in a positive direction from the club head origin toward the heel side of the golf club head, the y-axis extends in a positive direction from the club head origin towards the rear end of the golf club head, and the z-axis extends in a positive direction from the club head origin towards the crown of the golf club head;

wherein a moment of inertia about a golf club head center of gravity z-axis (Izz) generally parallel to the head origin z-axis is as at least 400 kg-mm 2 ;

wherein a moment of inertia about a golf club head center of gravity x-axis (Ixx) generally parallel to the head origin x-axis is as at least 270 kg-mm 2 ;

wherein the body defines an upper crown opening, a toe-side sole opening, and a heel-side sole opening;

wherein the toe-side sole opening and the heel-side sole opening are separated by a portion of the body that extends from a forward portion of the sole to a rearward portion of the sole; and

wherein the toe-side sole opening is larger than the heel-side sole opening.

2. The wood-type golf club head of claim 1 , further comprising a rear protuberance located at least on the heel side of the body and the rear end of the body, and wherein at least a portion of the heel-side opening is forward of the rear protuberance and at least a portion of the heel-side opening is raised relative to the rear protuberance.

3. The wood-type golf club head of claim 2 , wherein when the golf club head is in the normal address position at least one vertical section parallel to a xz-plane and passing through the rear protuberance intersects the rear protuberance, the toe-side sole opening, and a recessed portion of the body located heelward of the toe-side sole opening and proximate the rear protuberance.

4. The wood-type golf club head of claim 2 , wherein when the golf club head is in the normal address position in a heel side view and parallel to a yz-plane the rear protuberance is elevated relative to a front sit pad located at the front end of the body such that a first vertical distance measured from the rear protuberance to the ground plane is greater than a second vertical distance measured from the front sit pad to the ground plane.

5. The wood-type golf club head of claim 2 , further comprising a weight attached to the body proximate the rear protuberance.

6. The wood-type golf club head of claim 2 , wherein the toe-side sole opening has an outer perimeter including an angled edge that is angled relative to a xz-plane and angled relative to a yz-plane.

7. The wood-type golf club head of claim 2 , wherein the toe-side sole opening and heel-side sole opening are not mirror images.

8. The wood-type golf club head of claim 1 , wherein at least a portion of the toe-side opening is forward of the rear protuberance and raised relative to the rear protuberance.

9. The wood-type golf club head of claim 1 , wherein a first raised sole portion at least partially surrounds the heel-side opening.

10. The wood-type golf club head of claim 9 , wherein the first raised sole portion completely surrounds the heel-side opening.

11. The wood-type golf club head of claim 9 , wherein a second raised sole portion at least partially surrounds the toe-side portion.

12. The wood-type golf club head of claim 11 , wherein the second raised sole portion completely surrounds the toe-side portion.

13. The wood-type golf club head of claim 11 , wherein a vertical distance between the rear protuberance and at least one of the first raised sole portion and the second raised sole portion is between 2-12 mm.

14. The wood-type golf club head of claim 1 , wherein the face has a face area of no more than 4600 mm 2 , a mass of the club head is no more than 205 grams, a moment of inertia about a golf club head center of gravity y-axis (Iyy) generally parallel to the head origin y-axis is as at least 258 kg-mm 2 , and Zup is no more than 30 mm, where Zup is defined as the location of the center of gravity in the z-axis direction from the ground plane to the center of gravity when the club head is in the normal address position.

15. The wood-type golf club head of claim 14 , wherein the difference between the Zup of the golf club head and half of a head height of the golf club head is less than about −4.0 mm.

16. The wood-type golf club head of claim 14 , wherein the toe-side sole opening extends further rearward than the heel-side sole opening.

17. A wood-type golf club head comprising:

a body having front end, a rear end, a top side, a lower side, a toe side, a heel side, and a hosel positioned at the heel side of the body, a sole positioned at the lower side of the body, and a crown positioned at the top side of the body, the golf club head having a volume of from about 350 cm 3 to about 600 cm 3 and an interior cavity;

an adjustable head-shaft connection assembly coupled to the hosel and configured to adjust an orientation of the golf club head relative to a golf club shaft;

a face positioned at the front end of the golf club head and including a striking surface, the striking surface having a club head origin positioned at a geometric center of the striking surface, the club head origin defining a head origin coordinate system including a z-axis extending through the head origin in a generally vertical direction relative to a ground plane when the golf club head is in a normal address position; an x-axis extending through the head origin in a toe-to-heel direction generally parallel to the striking surface and generally perpendicular to the z-axis; and a y-axis extending through the head origin in a front-to-back direction and generally perpendicular to the x-axis and to the z-axis;

wherein the x-axis extends in a positive direction from the club head origin toward the heel side of the golf club head, the y-axis extends in a positive direction from the club head origin towards the rear end of the golf club head, and the z-axis extends in a positive direction from the club head origin towards the crown of the golf club head;

wherein a moment of inertia about a golf club head center of gravity z-axis (Izz) generally parallel to the head origin z-axis is as at least 400 kg-mm 2 ;

wherein a moment of inertia about a golf club head center of gravity x-axis (Ixx) generally parallel to the head origin x-axis is as at least 270 kg-mm 2 ;

wherein a moment of inertia about a golf club head center of gravity y-axis (Iyy) generally parallel to the head origin y-axis is as at least 258 kg-mm 2 ;

wherein the body defines an upper crown opening, one or more sole openings, and at least about 50% of the surface area of the sole comprises a composite material;

a rear protuberance located at least on the heel side of the body and the rear end of the body, and wherein at least a portion of the one or more sole openings is forward of the rear protuberance and at least a portion of the one or more sole openings is raised relative to the rear protuberance; and

a weight attached to the body proximate the rear protuberance;

wherein Zup is no more than 30 mm, where Zup is defined as the location of the center of gravity in the z-axis direction from the ground plane to the center of gravity when the club head is in the normal address position;

wherein a mass of the club head is no more than 205 grams; and

wherein when the golf club head is in the normal address position in a heel side view and parallel to a yz-plane the rear protuberance is elevated relative to a front sit pad located at the front end of the body such that a first vertical distance measured from the rear protuberance to the ground plane is greater than a second vertical distance measured from the front sit pad to the ground plane.

18. The wood-type golf club head of claim 17 , wherein when the golf club head is in the normal address position in a bottom view at least a portion of a rear edge of the rear protuberance is curved.

19. The wood-type golf club head of claim 17 , wherein a rearmost portion of the body extends further rearward than the rear protuberance as measured relative to the y-axis.