Apple packed the Series 9 model with sensors for tracking your heart rate ... Fusing the worlds of traditional sweat bands and watch straps, the ActionBand from Twelve South neatly comes in 40mm-45mm ...
Madness. The Apple Watch Series 9 retains the 41mm and 45mm case sizes introduced through the Series 7 in 2021, which means older bands will still be compatible with the latest smartwatch.