SHB-SC5EX Shank Part Design

We would like to inform you about the design for the shank part of YONEX Badminton shoes, SHB-SC5EX.
You would find some black dots at the shank part of SHB-SC5EX, and some of you might think this is a bit weird design.

We use the stiffer TOUGHBRID at the shank part of the midsole to support the foot and keep it stable during high-impact footwork.

Since we would like to show the shoes "STRONG" and "POWERFUL", we have inserted the black particles in TOUGHBRID material to remind people STRONG 'STONE' and 'ROCK' by its design.

Thank you very much for your understanding.