Sundog sunglasses represent great value for money, providing great styling with clear as day optics. The Serenity TB sunglasses offer classic styling that will look great just about anywhere. The TB stands for True Blue, which is a premium polycarbonate lens that provides a unique blue light filtration. Glare is greatly reduced, giving a subtle amber tint to everything, everything feels slightly enhanced. With super strong MaxFlex Rilsan frames and impact-resistant and shatter-proof lenses that give 100% UVA-UVB filtration, how can you overlook these stunning sunglasses? The unique patented lens technology completely blocks out blue light, this blue light contributes to eye strain and fatigue. You will love the look and clear viewing experience they provide at a fantastic price. A must for keeping the sun out of the eyes and seeing those shots flying into the distance.