The Titan, from the mountain to the ocean and everything in between!! The ultimate sport performance eyewear letting athletes take full advantage of Blocs wide range of performance lenses.The Titan lens replacement system makes it very easy to change lenses whenever and wherever life takes you.You simply fold in the temple which unlocks the lens. It doesnt get any easier.The KARBON TX frame and bi-core interchangeable injected temples are light and comfortable making the Titan the perfect choice for all outdoor sports.See Blocs Titan accessories and spares for Optical inserts, straps and more.XTR Karbon8 lenses optimize vision in virtually all-light conditions. We have a lot to offer!! Conditions change and so should your lenses. See our Lens simulator.All of our lenses are optical Class One and give exceptional clarity as well as providing Maximum protection against UVA/UVB and harmful blue light up to 400nm. Distortion free and impact resistant and tested to BS EN ISO 12312-1:2013.