The Swan OTG is the perfect option for those of us who wear prescription glasses. The Swan Over The Glass goggle fits comfortably over your corrective lenses, allowing you to see clearly while wearing prescription glasses in free fall. The goggle is extremely flexible and provides a comfortable fit for student and tandem jumpers. The clear portion of the goggle is made of a scratch resistant and unbreakable vinyl material. The elastic band tightens from the front and holds securely in free fall.