To better understand the construction of the SOLE (part 3)
Part 3: Rubber sole
Rubber is softer and ensures good grip while walking. The 2 horizontal grooves under the sole make the shoe more bendable.
The front part of the sole is asymmetrical, its extension of material on the outside reinforces stability as you swing.
The rounded, enveloping front of the sole moves with your foot at the end of your swing.