Native Grind Lens Kit - One Size - Blue - Native Grind Lens Kit. The Native Grind Lens Kit is a pair of replacement lenses for the Grind sunglasses. Life can certainly be a grind, so why not add a few pairs of lenses to your arsenal? Switch 'em up whenever the mood strikes or base it upon the power of the sun. Low light, medium light, crazy bright light. There is even one for daily power of the sun. Or just order up a pair to have as a backup to your current. Features of the Native Grind Lens Kit Includes a single pair of replacement Poly Crystal Carbonate lenses for the Native Grind sunglasses Optical-quality, impact-resistant lenses Blocks 100% of harmful UV light Eliminates glAre for sharp, clear vision with increased contrast and depth perception P. C.C.