Same features as the 15TH model but in this version with the best photochromic lenses in the world: those from NXT®. NXT® lenses improve contrast even in dark conditions, visual acuity and depth perception while providing unprecedented eye protection. Same features as the 15TH model but in this version with the best photochromic lenses in the world: those from NXT®. NXT® lenses improve contrast even in dark conditions, visual acuity and depth perception while providing unprecedented eye protection. They are produced in Lyon, France by Essilor-Luxottica and are guaranteed unbreakable for life. Unlike most standard photochromic lenses, NXT® lenses are fused into the mass of the polymer itself with a very complex manufacturing process, making them stronger and clearly optically superior to most competitors. Its semi-rigid molecular properties guarantee unique light management and incomparable eye protection against the sun's rays and atmospheric elements. But let's take a closer look at the main technical features of these incredible lenses, which are guaranteed to be the best in the cycling scene. DURABILITY: They are indestructible. Unlike the polycarbonates used in all photochromic lenses which are rigid, NXT® lenses are a "resiny" and almost "rubbery" material that bends. Impossible to break them. Simply unlike all the others, these don't break. OPTICAL QUALITY: They have much lower internal tension and chromatic dispersion than classic polycarbonate (chromatic aberration 1.5 times less than polymers) and therefore sharper and higher definition images. The optical quality of NXT® lenses is similar to that of mineral glass. Sharp images. Perfect vision. RESISTANCE TO SOLVENTS: NXT® resists the effect of Acetone. It is not attacked by chemicals or solvents such as methyl alcohol. LIGHT TRANSMITTANCE VARIATION: Photochromic lenses in NXT® have the widest variation in light transmittance available in the sports scene today. They range from Category 0 (Lt. 80%) to Category 3 (Lt. 17%) and cover four brightness categories. Impossible to do better. The variation in the degree of obscuration is therefore 63%. Very high. REACTION TIME: Very fast. At an average temperature of 23°, NXT® lenses change color from clear to completely smoked in less than 20 seconds. They are very fast. It is possible to purchase additional rims in various colors separately, so you can change the look of your glasses. Technical glasses especially suitable for those who practice cycling at a very high level. Specifications: - Category: NXT Lenses - Photochromic Cat. 0 to 3 - Weight: 33 grams - Lenses: 1 - Adjustable bridge: Yes - Air Flow technology: Yes - Contents: Glasses, Frame, Cloth, Microfiber bag, Hard case.