| abstract |
Golf ball 2 has a spherical core 4 , a mid layer 6 covering this core 4 , a reinforcing layer 8 covering this mid layer 6 , and a cover 10 covering this reinforcing layer 8 . Base polymer of this mid layer 6 includes an ionomer resin as a principal component. Base polymer of this cover 10 includes a thermoplastic polyurethane elastomer as a principal component. The cover 10 has a thickness Tc of equal to or less than 0.6 mm. The cover 10 has a hardness Hc as measured with a Shore D type hardness scale of equal to or less than 54. The cover 10 has a volume V of equal to or less than 3.0 cm 3 . A product obtained by multiplying the thickness Tc, the hardness Hc and the volume V is equal to or less than 90. The reinforcing layer 8 includes a thermosetting resin as a base polymer. The reinforcing layer has a thickness of 3 μm or greater and 50 μm or less. |