OverviewEquipped with a 8-base frame and our Auto Sun lens technology, Morrison is everything you want in an all-day pair of shades. Ready to change with your adventure, Morrison will take you from high mountain trail rides to afternoon casts. Auto Sun is designed for days outside in changing light conditions. Photochromic technology automatically adjusts from a low-light, bright yellow with a 28% Visual Light Transmission (VLT), to a high visibility persimmon with a 15% VLT for sunny conditions, while polarization protects and heightens color, definition, and detail. Zeal Optics frames are made from Z-Resin, a unique plant-based polymer derived from the castor plant. This durable plant-based material contributes to a lighter weight frame, for more comfortable everyday wear and activities.