Ideal for mountaineering, climbing, and trail running, Julbo's Trek achieves optimum performance when you're moving fast and light in extreme environments photochromic lenses darken and lighten depending on the light's intensity.This product will be shipped directly from Julbo and will leave their warehouse in 2 3 business days. Eligible for UPS ground shipping only. . Fits medium profiles for fast and light performance in extreme environments. Zebra photochromic lenses darken or lighten depending on light intensity VLT changes from 42% to 7% with activation from 22 28 sec.. VLT Visible Light Transmission: percentage of available light allowed to reach the eye the lower the number, the darker the lens. Category 2 protection in the undergrowth category 4 protection in bright sunlight. 100% protection from UVABC rays. Brown lens tint accentuates relief antifog coating prevents condensation. Recommended for mountain biking, trail biking, running, climbing, skiing, and other outdoor sports not recommended for driving. Panoramic shape with a wide lens surface for broad vision spectrum. Detachable shields block lateral rays from intense glare or allow superior ventilation when necessary. Lightweight, ergonomic Grilamid frame material for comfort and hold. 360deg adjustable temples stem ends bend in every direction, easy to wear, provide good hold when worn with helmet, beanie, or alone. Grip Tech inserts at stem ends for comfort and hold do not stick to hair.