The triathletes choice due to exceptional visibility and a new hi-tech 'Ratchet Quick-fit' adjustment mechanism. This is truly a radical goggle! CLT™-Curved Lens Technology for exceptionally wide peripheral vision Unique larger sized one piece frame for a superior fit Multi purpose goggle for swimming and aqua sports Fogbuster™ impregnated anti-fog lenses New hi-tech 'Ratchet' dual action quick fit adjustable strap system 100% silicone headstrap