To better understand the construction of the SOLE (part 2)
Part 2: Rubber sole
Rubber is softer and ensures good grip while walking. The 2 horizontal grooves under the sole allow the shoe to flex better.
The front part of the sole is asymmetrical, the extended material on the outside gives extra stability as you swing.
The rounded, enveloping front of the sole moves with your foot at the end of your swing.