Golf club head

1. A golf club, comprising:

a shaft;

a club head defining an interior cavity, a sole defining a bottom portion of the club head, a crown defining a top portion of the club head, a face defining a forward portion of the club head and including a striking surface width (W ss ), and a hosel by which the shaft is attached to the club head, wherein the hosel defining a hosel bore;

a slot positioned in the sole of the club head adjacent the face and extending into an interior cavity of the club head, the slot having a slot width defined as the distance between a forward edge of the slot and a rearward edge of the slot; wherein a portion of the sole being located between the face and the forward edge of the slot;

a mass pad located on the sole within the interior cavity and positioned proximate the face in a forward portion of the sole, the mass pad being located rearward of the slot and proximate to the slot, and the mass pad extending substantially in a heel-to-toe direction;

wherein the club head has a balance point located on the face and the balance point is no more than 3 mm above of a geometric center of the face;

wherein the club head has a center of gravity located no more than 30 mm horizontally rearward of the geometric center of the face, a coefficient of restitution (COR) of no less than 0.80 as measured at the balance point on the face, and a characteristic time measured at the geometric center of the face of no less than 218 microseconds; and

wherein the club head has a height less than 46 mm and a volume less than 210 cm 3 .

2. The golf club of claim 1 , further comprising:

one or more weight ports formed in the club head; and

at least one weight configured to be retained at least partially within one of the one or more weight ports.

3. The golf club of claim 2 , wherein the at least one weight having a weight mass between 0.5 gram and 20 grams.

4. The golf club of claim 1 , wherein the slot having a slot length of about 25% to about 95% of the width of the striking surface W ss .

5. The golf club of claim 1 , wherein a distance between a forwardmost point and a rearwardmost point on the club head measured along an axis parallel to the y-axis when the club head is at normal address position is greater than 75 mm.

6. The golf club of claim 1 , wherein the club head is formed of at least one alloy of steel.

7. The golf club of claim 1 , wherein the club head is formed of at least one alloy of titanium.

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

9. The golf club of claim 1 , further comprising:

a sleeve for securing the shaft to the club head;

wherein selectively attaching the sleeve adjusts at least one of a loft angle and a lie angle of the club head.

10. A golf club, comprising:

a club head defining an interior cavity, a sole defining a bottom portion of the club head, a crown defining a top portion of the club head, a face defining a forward portion of the club head and including a striking surface width (W ss ), and a hosel defining a hosel bore;

a golf club shaft having a lower end portion;

a mass pad located on the sole within the interior cavity and positioned proximate the face in a forward portion of the sole, the mass pad extending substantially in a heel-to-toe direction;

a lower opening positioned in the sole of the club head and extending into the interior cavity of the club head, the lower opening being located proximate a bottom end of the hosel such that a passage in the bottom end of the hosel provides communication between the hosel bore and the lower opening;

a sleeve mounted on a tip end of the golf club shaft and adapted to be inserted into the hosel bore; and

a fastener having a head portion and a shaft portion, the shaft portion of the fastener extending through the passage, the sleeve being selectively attachable to the shaft portion of the fastener when the sleeve is inserted into the hosel bore;

wherein selectively attaching the sleeve adjusts at least one of a loft angle and a lie angle of the club head;

wherein the club head has a balance point located on the face and the balance point is no more than 3 mm above of a geometric center of the face;

wherein the club head has a center of gravity located no more than 30 mm horizontally rearward of the geometric center of the face, a coefficient of restitution (COR) of no less than 0.80 as measured at the balance point on the face, and a characteristic time measured at the geometric center of the face of no less than 218 microseconds; and

wherein the club head has a height less than 46 mm and a volume less than 210 cm 3 .

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

12. The golf club of claim 10 , further comprising:

at least one weight port positioned in the club head proximate the mass pad, the weight port extending into the interior cavity of the club head; and

at least one weight having a weight mass between 0.5 gram and 20 grams, the at least one weight configured to be installed at least partially within the at least one weight port positioned in the club head.

13. The golf club of claim 10 , further comprising:

a slot positioned in the sole of the club head adjacent the face and extending into the interior cavity of the club head, the slot having a slot width defined as the distance between a forward edge of the slot and a rearward edge of the slot; wherein a portion of the sole being located between the face and the forward edge of the slot.

14. The golf club of claim 10 , further comprising:

a channel positioned in the sole of the club head adjacent the face and extending into the interior cavity of the club head, the channel having a channel width defined as the distance between a forward edge of the channel and a rearward edge of the channel; wherein a portion of the sole being located between the face and the forward edge of the channel.

15. A golf club, comprising:

a golf club shaft having a butt end and a tip end;

a club head defining an interior cavity, a sole defining a bottom portion of the club head, a crown defining a top portion of the club head, a face defining a forward portion of the club head and including a striking surface width (W ss ), and a hosel defining a hosel bore;

a face positioned at the forward portion of the club head;

at least one removable weight attached to the club head;

a lower opening positioned in the sole of the club head and extending into the interior cavity of the club head, the lower opening being located proximate a bottom end of the hosel such that a passage in the bottom end of the hosel provides communication between the hosel bore and the lower opening;

a sleeve mounted on the tip end of the golf club shaft and adapted to be inserted into the hosel bore; and

a fastener having a head portion and a shaft portion, the shaft portion of the fastener extending through the passage, the sleeve being selectively attachable to the shaft portion of the fastener when the sleeve is inserted into the hosel bore;

wherein selectively attaching the sleeve adjusts at least one of a loft angle and a lie angle of the club head;

wherein the club head has a balance point located on the face and the balance point is no more than 3 mm above of a geometric center of the face;

wherein the club head has a center of gravity located no more than 30 mm horizontally rearward of the geometric center of the face, a coefficient of restitution (COR) of no less than 0.80 as measured at the balance point on the face, and a characteristic time measured at the geometric center of the face of no less than 218 microseconds; and

wherein the club head has a height less than 46 mm and a volume less than 210 cm 3 .

16. The golf club of claim 15 , wherein the at least one removable weight is attachable to the club head at two or more positions.

17. The golf club of claim 15 , further comprising:

a channel positioned in the sole of the club head adjacent the face and extending into the interior cavity of the club head, the channel having a channel width defined as the distance between a forward edge of the channel and a rearward edge of the channel; wherein a portion of the sole being located between the face and the forward edge of the channel.

18. The golf club of claim 15 , further comprising:

a slot positioned in the sole of the club head adjacent the face and extending into the interior cavity of the club head, the slot having a slot width defined as the distance between a forward edge of the slot and a rearward edge of the slot; wherein a portion of the sole being located between the face and the forward edge of the slot.

19. The golf club of claim 15 , wherein the golf club head is formed of at least one alloy of titanium.

20. The golf club of claim 15 , wherein the golf club head is formed of at least one alloy of steel.

21. A golf club, comprising:

a shaft;

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, and 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 gap defined in the sole adjacent the face and extending into the interior cavity of the club head and a portion of the sole being located between the face and the gap; and

a sleeve for adjustably securing the shaft to the golf club head to selectively adjust at least one of a loft angle, lie angle and face angle of the club head;

wherein, the golf club head has a center of gravity (CG) projection of less than about 3 mm above a center of the face;

wherein a coefficient of restitution of the golf club head measured at the center of the face is 0.80 or greater;

wherein a mass of the golf club head is between about 185 grams and about 245 grams;

wherein a maximum dimension from the forward portion to the rearward portion is greater than about 75 mm;

wherein the golf club head has an above ground center-of-gravity location Zup measured in mm;

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

wherein the golf club head 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· Z up+165;

wherein the club head has a balance point located on the face and the balance point is no more than 3 mm above of a geometric center of the face;

wherein the club head has a center of gravity located no more than 30 mm horizontally rearward of the geometric center of the face, a coefficient of restitution (COR) of no less than 0.80 as measured at the balance point on the face, and a characteristic time measured at the geometric center of the face of no less than 218 microseconds; and

wherein the club head has a height less than 46 mm and a volume less than 210 cm 3 .