Golf club head

A golf club head, comprising:

• a body, defining an interior cavity and comprising:
• a sole portion, positioned at a bottom region of the golf club head;
• a crown portion, positioned at a top region of the golf club head;
• a skirt portion, positioned around a periphery of the golf club head between the sole portion and the crown portion;
• a forward region;
• a rearward region, opposite the forward region;
• a heel region;
• and
• a toe region, opposite the heel region;
• a face portion, coupled to the body at the forward region of the body, wherein the face portion has a bulge radius between 190 mm and 600 mm and a roll radius between 100 mm and 600 mm;
• a first wall, protruding uprightly from the sole portion, extending lengthwise in a heel-to-toe direction, and made of a first material having a first modulus of elasticity between 15 GPa and 350 GPa;
• and
• a stiffener located within the interior cavity of the body and interposed between the interior surface of the face portion and the first wall, wherein the stiffener is made of a second material having a second modulus of elasticity less than the first modulus of elasticity, the second modulus of elasticity is between 0.5 GPa and 30 GPa, and the second material has a hardness of at least Shore 5.95D;
• wherein:
• a coefficient of restitution (COR) of the golf club head is at least 0.78;
• a characteristic time (CT) of the golf club head at a center of the face portion is no more than 257 microseconds;
• the golf club head further comprises a second wall, protruding uprightly from the sole portion, extending lengthwise in a generally front-to-back direction, and made of a third material having a third modulus of elasticity less than the first modulus of elasticity;
• the second modulus of elasticity is greater than the third modulus of elasticity;
• and
• the stiffener abuts the second wall.