This Replacement Lens Compatible With Four Seven Goggles Helps Amplifies Color Contrast Especially InSnowy Or Overcast Light Conditions , Enabling The Eye To Identify Terrain Variations BetterImproved Visual Acuity:Sigma Lenses Amplify Contrast To Help You See Terrain Details Better, Especially In Snowy Or Overcast Light ConditionsSpecifications:- Primary Practice : Alpine Ski- Dspc Category 1 (Pam) : Lenses- Dspc Category 2 (Pam) : Lenses- Article Type : After Market- Dspc Conditioning : 1x1
