Patent ID: 7261650

Claim:
A golf ball comprising a core, a mid layer and a cover, said mid layer having a hardness of 50 or greater and 70 or less, and a thickness of equal to or greater than 0.8 mm, said cover having a hardness of less than 57, and a thickness of less than 1.5 mm, said golf ball having numerous double radius dimples and numerous triple radius dimples on the surface thereof, said double radius dimple comprising a first side wall face having a curvature radius R 1 , and a bottom face having a curvature radius R 2 that is 5 times or more and 55 times or less greater than the curvature radius R 1 and being positioned to the bottom side than the first side wall face, said triple radius dimple comprising a first side wall face having a curvature radius R 1 that is equal to or greater than a phantom curvature radius Rx, a second side wall face being positioned to the bottom side than the first side wall face and having a curvature radius R 2 that is smaller than the phantom curvature radius Rx, and a bottom face being positioned to the bottom side than the second side wall face and having a curvature radius R 3 that is equal to or greater than the phantom curvature radius Rx, proportion of the number of the double radius dimples in total number of the dimples being 20% or greater and 42% or less, and proportion of the number of the triple radius dimples in total number of the dimples being equal to or greater than 50%.