Mountain Photochromic Sunglasses Category 2->4 - Alpi Black

- Photochromic lenses, category 2 to 4- Polycarbonate lenses: better weight / impact resistance ratio- 100% ANTI-UV filter- Geometry: Spherical 8-base for optimal peripheral vision- Grey tint to see all contours in the terrain, whether you are on rock or snow

Photochromic lenses automatically adapt to light conditions.The lens darkens in approximately 30 seconds (45 seconds to clear). The tint adjusts gradually, and your eyes adjust at the same rate.The apparent brightness varies little, even if the outside brightness changes.Cold temperatures will activate (darken) the lens faster.

Clean the sunglasses carefully and with suitable products to avoid scratching your lenses and having blurred vision because of dirt. Find out how to easily clean your sunglasses the right way!https://conseilsport.decathlon.fr/conseils/comment-nettoyer-mes-lunettes-de-soleil-tp_20736

Eye protection is serious stuff!Based on a study: "Ocular phototoxicity and altitude among mountain guides"; Three important points to remember:- The intensity of the sun's rays increases by 12% every 1,000 m.- In addition to the direct radiation, your eyes are also exposed to the reverberation of the UV rays from the snow- With the tinted lenses, your pupils are open wider and more sensitive, so you must wear your protective shields on glaciers.