HOTER Thick Solid Color Sweatband Set - Navyblue (1 Headband + 2 Wristbands)

Would this fit around my neck snug enough to keep the sun off?

Is the headband small enough to fit a 2 yr olds head? I assume it’s starts small and stretches to fit all sizes but want to make sure it is not too bi

Would these be able to cover your ears to hold in earbuds?

Will these fit on kids?