Golf club head

1. A golf club head, comprising:

a body defining an interior cavity, a sole positioned at a bottom portion of the golf club head, a crown positioned at a top portion of the golf club head, and a skirt portion positioned around a periphery of the golf club head between the sole and the crown, the body also having a forward portion and a rearward portion and a maximum above ground height;

a face positioned at the forward portion of the body;

a mass pad located on the sole within the interior cavity and positioned proximate the face in a forward portion of the sole; and

at least one weight attached to the sole of the golf club head;

wherein:

the body height is less than about 46 mm;

the face has a loft angle greater than about 13 degrees;

the golf club head has a center of gravity (CG) located at an above ground center-of-gravity location (Zup) that is less than about 19.0 mm, a center-of-gravity z-axis extends vertically through the CG, and a center-of-gravity x-axis extends horizontally through the CG in a direction generally tangential to the face at the ideal impact location;

the golf club head has a CG with a head origin x-axis (CGx) coordinate between about −2 mm and about 6 mm and a head origin y-axis (CGy) coordinate no less than 15 mm and no more than 26.1 mm, and a head origin z-axis (CGz) less than 0 mm;

further wherein the golf club head:

the golf club head has a coefficient of restitution (COR) having a value of at least about 0.80 at a center of the face;

the golf club head has a balance point located on the face and the balance point is no more than 3 mm above the center of the face, and the face has an average face thickness that ranges from about 1.0 mm to about 4.5 mm; and

a volume of the golf club head is less than about 210 cm 3 .

2. The golf club head of claim 1 , wherein the coefficient of restitution at the center of the face is 0.81 or greater.

3. The golf club head of claim 1 , further comprising a channel defined in the sole adjacent the face and extending substantially in a heel-to-toe direction.

4. The golf club head of claim 3 , wherein the body is formed from a combination of a steel alloy and a composite.

5. The golf club head of claim 1 , further comprising a slot positioned in the sole of the club head and extending into an interior cavity of the club head, the slot extending substantially in a heel-to-toe direction.

6. The golf club head of claim 5 , wherein the body is formed from a combination of a steel alloy and a composite.

7. The golf club head of claim 1 , wherein the body is formed from a combination of a steel alloy and a titanium alloy.

8. The golf club head of claim 1 , wherein the body is formed from a combination of a titanium alloy and a composite.

9. The golf club head of claim 1 , wherein the body is formed from a combination of a steel alloy, a titanium alloy, and a composite.

10. The golf club head of claim 1 , wherein the body is formed from a combination of a steel alloy and a composite.

11. The golf club head of claim 1 , further comprising a sleeve for securing a shaft to the golf club head.

12. The golf club head of claim 1 , wherein the at least one weight is secured by a mechanical fastener.

13. The golf club head of claim 1 , wherein the at least one weight is secured by one or more screws.

14. The golf club head of claim 1 , wherein the at least one weight threadingly engages the sole.

15. The golf club head of claim 1 , wherein the at least one weight is formed of a material having a higher density than the material used to form the body.

16. The golf club head of claim 15 , wherein the at least one weight is formed of a material having a density no more than 19 g/cc.

17. The golf club head of claim 15 , wherein the at least one weight and the mass pad are each formed of a material having a density no more than 19 g/cc.

18. The golf club head of claim 1 , wherein the at least one weight further comprises at least two weights and each weight threadingly engages the sole.

19. A golf club head, comprising:

a body defining an interior cavity, a sole portion positioned at a bottom portion of the golf club head, a crown portion positioned at a top portion of the golf club head, and a skirt portion positioned around a periphery of the golf club head between the sole and the crown, the body also having a forward portion and a rearward portion and a maximum above ground height; and

a face positioned at the forward portion of the body;

at least one weight attached to the sole of the golf club head;

a slot positioned in the sole of the club head and extending into an interior cavity of the club head, the slot extending substantially in a heel-to-toe direction;

wherein:

the body height is less than about 46 mm; and

the face has a loft angle greater than about 13 degrees; and

wherein the golf club head has a center of gravity (CG) located at an above ground center-of-gravity location (Zup) that is less than about 19.0 mm, a center-of-gravity z-axis extends vertically through the CG, and a center-of-gravity x-axis extends horizontally through the CG in a direction generally tangential to the face at the ideal impact location;

wherein the golf club head has a CG with a head origin x-axis (CGx) coordinate, a head origin y-axis (CGy) coordinate, and a head origin z-axis (CGz) coordinate;

further wherein the golf club head:

has a moment of inertia about the center-of-gravity z-axis Izz measured in kg-mm 2 ;

has a moment of inertia about the center-of-gravity x-axis Ixx measured in kg-mm 2 ;

wherein Izz and Ixx are related to the above ground center-of-gravity location Zup by the equation:

Ixx+Izz≥ 20· Zup+ 165; and

wherein the golf club head has a balance point located on the face and the club head has a coefficient of restitution (COR) of no less than 0.80 as measured at the balance point on the striking face, and a characteristic time measured at a geometric center of the face of no less than 218 microseconds;

a volume of the golf club head is less than about 210 cm 3 .

20. The golf club head of claim 19 , wherein the crown has a thickness less than about 0.65 mm over at least about 70% of the crown.

21. The golf club head of claim 19 , wherein the balance point is no more than 3 mm above the geometric center of the face, and the face has an average face thickness that ranges from about 1.0 mm to about 4.5 mm.