D7 uses a visibly more open knit across the instep than underfoot. The current All-Season specification lists 21,000 breathable openings across that upper zone.
Technology note 01
Airflow is
about placement.
The D7 All-Season instep uses open knit where heat tends to collect, while the bottom stays soft and substantial.
21,000instep openingsmapped across the upper zone
These photos show different parts of the sock. The slider reveals each view; it does not measure airflow or temperature.
Read the knit
Read the knit.
Understand the feel.
Feel the full build