Optimum Polarized Automatic Plus is ZEAL's patented Polarized + Photochromic lens technology built to adjust to changing light conditions and is the only goggle lens you'll ever need on the mountain. This lens, builds on the foundation of our Optimum and Optimum Polarized technologies, incorporating all their technologies including our proprietary Everclear Anti-fog and Permashield Hardcoat. The YB features a yellow-base for added contrast in low-light conditions, and automatically adjusts from a low-light bright yellow with a 33% VLT to a high visibility, dark persimmion with an 17% VLT for sunny conditions. With Automatic+, you'll never change your lens again as you explore the mountains, skiing, snowboarding, snowmobiling, climbing or trekking.