Golf club head with lightweight shaft-receiving structure

A golf club head comprising:

• a strike face and a body secured together to define an interior cavity;
• the body comprising a crown, a sole opposite the crown, a heel, a toe opposite the heel, a skirt adjoining the crown and the sole, and a shaft-receiving structure;
• the shaft-receiving structure comprising a hosel and a shaft sleeve, the hosel formed of a first material comprising a first density;
• wherein:
• the hosel comprises a hosel wall forming at least a first portion of a hosel bore, a hosel wall upper portion forming a hosel bore opening, and a hosel base opposite the hosel bore opening, the hosel base formed at an interior surface of the sole, near the heel;
• the hosel defines a hosel bore axis concentric with the hosel bore;
• the shaft sleeve is insertable into the hosel through the hosel bore opening and configured to couple a golf club shaft with the hosel;
• the hosel bore opening is configured to receive the shaft sleeve;
• a lip formed at a bottom portion of the hosel wall upper portion;
• the shaft-receiving structure further comprises a tube insert extending through the interior cavity, from the lip to the hosel base;
• the tube insert is separated from the hosel bore opening by the hosel wall upper portion;
• wherein a top end of the tube insert is retained by the lip, the shaft sleeve, and the hosel wall;
• and
• wherein a bottom end of the tube insert is retained by a bottom lap joint, the hosel base, and an end cap;
• wherein the tube insert is formed of a second material comprising a second density less than the first density;
• the tube insert forms a remainder of the hosel bore;
• and
• the tube insert seals the hosel bore from the interior cavity.