The SINNER Steelhead sunglasses are equipped with our newest lens technology: SINTRAST® lenses. The lenses not only eliminate high energy of blue light and filter 100% UV light, this lens technology is a combination of colour highlight and colour contrast. SINNER SINTRAST® lenses provide high clairity, high contrast, enhance details and are comfortable to your eyes. Resulting in a view without any distortion and maximum protection for your eyes. Steelhead sunglasses are specially designed for water sports. This means that the SINTRAST® WATERSPORTS high contrast lenses colour filter technology is focussing on water. The dark grey mirror category 3 lenses recduce glare, but not all, because you need to see waves coming in your direction