The Scott Hustle/Tyrant/Split Goggle Single Works Lens are packed with features...Specifications Include:100% UV protection - all Scott lenses are optically engineered to screen out 100% of harmful UVA/UVB raysImpact resistance - in order to ensure that riders are safe from the impact of pebbles and flying debris all Scott lenses not only meet, but exceed the required impact resistance standards required for MX lenses2-pin works lenses - the historic Scott Works asymmetrical tear off pin system features one stationary pin and one adjustable pin. The adjustable pin allows for micro tuning the tear off tension and for perfecting the fit according to rider preference. Both pins can be easily removed to fit the Works Film SystemFor light sensitive versions of the lens - Scott light sensitive lenses engage photo-chromic technology and adapt automatically to sunlight intensity. These lenses react to light changes and within seconds the lens will darken when the brightness gets stronger or lighten then the sunlight gets weaker