The Oakley SI Holbrook Metal Sunglasses took the features of their original Holbrook(TM) glasses and crafted them into a lightweight steel frame version with advanced technology. These tactical sunglasses feature unobtainium® to increase grip and integrates a three-point fit to relieve pressure points and hold the lenses in a precise optical alignment. The lenses themselves are made from Plutonite® to filter out 100% of UVA, UVB, UVC and harmful blue light up to 400nm while its integrated Prizm(TM) technology helps enhance color and contrast to see in more detail.