Polarized Replacement Sunglasses Lenses for Spy Optics Dirk (Fire Red Mirror) 100% fully covered mirror coating which provides 100% UV protection. Permanent coating which repels water, dirt and dust. Impact Resistance-Passed Drop Ball Test (U.S. CFR Title 21 (FDA) Part 801.410. Fast Shipping and Long Durability. 100% polarized lenses.