The Nauders is a SINNER ski snowboard goggle with a very easy changeble lens system.The Nauders comes standard with an additional SINTEC polarized lens.The SINTEC-° lens (Category 2) is polarized (reduced glare and reflections), enhances contrast, depth perception and offers 100% UVA UVB UVC protection.The mirror lens (Category 3) is suitable for very sunny conditions, reduces glare and offers 100% UVA UVB UVC protection.The double lens, anti-fog coating on the inside of the lens and ventilation channels in the frame and lens reduces the likelihood of condensation on the inside of the lens.The triple layer of hypoallergenic foam around the frame prevents pressure points on the faces and is made of anti-allergic material.The strap is made of elastic material, is easy to adjust and long enough to comfortably carry a helmet.Due to the shape of the frame, the spectacles are comfortable to wear with a helmet.By using TPU (Thermoplastic Polyurethane), the frame is strong and flexible and closely fits the facial contours.SPECIFICATIONS:Lenses:CAT.S3 DBL FLL ORNG MRR + CAT.S2 DBL ORNG SINTEC.