Headstrap for 10 year old? BoboVR?

Hi i want to buy a new headstrap for my sons quest 3s, am looking at the BoboVR M3 with battery, but can anyone confirm this would fit a 10 year old (guess normal size head for the age lol), like can it be small enough? Are there any other straps i should look at as well with battery? The BoboVR is 70eur here.