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 doesn’t get any easier. The rest is easy…. The KARBON TX™ frame and bi-core interchangeable injected temples are light and comfortable making the Titan the perfect choice for all outdoor sports.   Photochromic lens technology Forget swapping lenses when light conditions change. Bloc’s superior fast reacting Photochromic lens technology, adjusts to current light conditions by gradually darkening when exposed to increasing UV light intensity and returning to its original state when levels decrease. Please note, photochromic lenses react to UV rays and will not darken when worn behind a helmet visor or motor vehicle windscreen that blocks UV light. They must be exposed to direct sunlight to initiate. Photochromic range for this lens is Cat 1-3 provides superior definition in changing light etc etc.. 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    Features: Adjustable nose pads, Sports hinges, Easy quick lens change system. Lightweight BX1000 core injected temple tips. Suitable for medium to large faces. Photochromic Category 1-3 lenses