Unless they changed, they are adjustable by grabbing the ear piece and sliding them down the silver rods of the headband. The silver rods slide in gray plastic tubes on the earpiece. It takes more force than you think.My 3M Bluetooth Workphones came today.
Haven't had a chance to use them yet, but there's something about them I may have a problem with, and that is they are not adjustable.
Tried them on, and they seem to fit right, but I wonder if they will cover my ears with a ball cap on, then add a mesh face shield that I wear when I weed eat.
All the other brands I've had let you increase the length of the ear pieces.