Optimum Polarized Automatic Plus Rose-Base 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 Rose-Based (RB) lens features a rose-base for added contrast in low-light conditions, and automatically adjusts from a low-light rose with a 38% VLT, to a high visibility, deep rose with a 20% VLT for sunny conditions. With Automatic+, you'll never change your lens again as you explore the mountains, skiing, snowboarding, snowmobiling, climbing or trekking.