I've never in 50 years of swimming been able to find a pair of goggles or a mask that I'm completely comfortable with. When something sounds to good to be true, it usually is. On this occasion it was all true. I got the app, scanned my face, sent off payment and a little over 3 weeks later arrived at my door.(uk). Once I'd fitted the correct nose band it was a revelation. I hardly no I'm wearing them and never have to remove or adjust them until I leave the pool or lake. This may sound like I've got shares in magic5 or on the payroll but I can assure you I'm not. I love my 2 pairs I've bought and can't recommend them enough. (I am currently trying to buy some for my autistic son and am having a bit of trouble using the face scanner). So not all perfect but we'll get there. Very happy customer from England