The hole position on the top of the foot has been designed to ensure intense mechanical ventilation, when the external temperatures are very high and therefore inside the shoe, the humidity is very high.
This adds to the high breathability of the fabric of which this particular sock is made, i.e. a micro-polyamide yarn, able of quickly carrying sweat outside.
The hole is also knitted with a flat seam that does not cause discomfort and adapts perfectly to the natural movements of the foot.