Polycarbonate: Polycarbonate is a material often used in eyewear for extreme activities because it provides high impact protection and is very lightweight.
Mineral: Mineral lenses undergo extensive processing to become resistant to impacts, scratches and provide high infrared rays absorption.
CR39: Is an organic resin used in our lens production to provide resistance to particles and high resistance to punctures.
Nylon: The use of nylon combines the excellent properties of polycarbonate with superior elasticity, making our lenses even more resistant.
The North Face Sunglasses Spectra Lenses Program:
The North Face Eyewear Collection is committed to the research of lenses to suit all athletes. The highest quality materials and the most innovative technologies are combined to create the best lens for every situation. All Spectra lenses guarantee 100% UV protection. Spectra lenses program is defined into four different macro categories of lenses addressed for a different use and light conditions:
Spectra 5: High light absorption. Suitable for strong light conditions such as mountaineering, water sports and skiing (cat. 4 - not for driving).
Spectra 10: Constant light absorption. Suitable for a polyvalent use (cat. 3).
Spectra 20: Low light absorption. Suitable for low light conditions and misty sunlight (cat. 2 and 1).
Spectra 90: Suitable for very low light conditions like cloudy weather or night use (cat. 0).
