This headlamp is perfect for me because it produces very bright light (at the request, or by pressing a button in 3 different brightness levels), and it is so light (72 g with batteries) that you hardly notice them. Of course the elastic band can be adapted to the head size and is fully seated. Running I have the lamp but not tested because I mainly use to illuminate different dark corners of my house, where I need to work with both hands. Different users, I agree that the power button is difficult to use if you have already created the lamp. Therefore, I turn it whatsoever beforehand a. Very handy in this context is for me that I can set different angles of inclination at the lamp so that the light there seems specifically where I need it. For me, a strong buy recommendation!