The nose bridge is adjustable to fit according to your needs. Finally, there is an adjuster on the strap at the back that allows the strap to lengthen or shorten to fit properly on the head without letting water in, while also being comfortable without excessive pressure. A very easy and quick adjustment design. If you want to tighten, pull the straps from the back, and if you want to loosen, press the one (and only) button and alternately loosen the sides.