BOLD Emerald Photochromic Sunglasses – MTB, Ski & Lifestyle EyewearBOLD Emerald Photochromic Sunglasses All Terrain Clarity, Stealth Aesthetic The BOLD Emeralds are sleek, sharp, and made to adapt. Designed for athletes who demand performance and style, these sunglasses feature rimless photochromic lenses that shift from clear to dark depending on the light. Whether you're riding in and out of tree cover on your mountain bike or skinning up at dawn for a backcountry descent, Emeralds give you the coverage and clarity