Golf club head

A wood-type golf club head comprising:

• a metal face having a front surface and an inner surface;
• a crown;
• a metal sole comprising a first elongated groove and a second elongated groove;
• an interior cavity;
• and
• a low-density filler material disposed within the interior cavity between the inner surface of the face and a front wall of the first elongated groove,
• wherein each of the face and the sole is composed of a metal alloy material,
• wherein the sole has a thickness of 0.030 to 0.50 inch,
• wherein the first groove comprises a first groove opening disposed proximate to the face and extending in a toe-to-heel direction, at least one negative draft wall, and a depth that varies as the groove extends from a heel side to a toe side,
• wherein the first groove opening comprises a toe-side portion having a first front-to-back width, a heel-side portion having a second front-to-back width, and a central portion having a third front-to-back width connecting the toe-side portion to the heel-side portion,
• wherein the first groove opening is spaced 0.100 inch to 1.00 inch away from the front surface of the face,
• wherein the first groove has a wall thickness of between 0.010 inch and 0.200 inch, and
• wherein the second groove extends approximately perpendicular to the face.