The Holbrook is undoubtedly Oakley's most classic, best-selling frame, so it's understandable that Oakley's optical engineers would update it with the newest technology. Oakley's Holbrook Mix Prizm Sunglasses control light transmission to maximize contrast and enhance overall visibility in casual settings, and Plutonite eliminates 100% UVA, UVB, UVC, and harmful blue light up to 400mm for safe shading. Oakley updated the Holbrook's standard O Matter frame with stainless steel reinforcements for long-lasting durability. Proposition 65 Warning for California Consumers: This product contains chemicals known to the State of California to cause cancer and/or birth defects or other reproductive harm.