The polarizing filter in the cressi sunglasses guarantees sharp vision free of reflections and glare. Cressi polarized sunglasses block harmful sunlight reflected from horizontal surfaces, such as water or a road surface, while allowing vertical light to reach the eye. Vertical light is important for human eyes and improves vision. Cressi sunglasses have superior optical quality; they block reflections and protect against uv rays. They offer sharp vision that is rich in detail and increases contrast, protecting the eyes from harmful rays. This combination improves comfort and decreases eye fatigue