Kaenon Hard Kore Performance Sunglasses - Adult The ultimate performance sunglass from Kaenon is the Hard Kore design. Lightweight, durable, and made for sport use, these glasses follow the natural form of your head for a more comfortable fit. Incorporated in the TR-90 frame are Variflex rubber temple tips and nose pads that prevent slipping as you sweat. The lenses are made from SR-91 material in 8.25 base curve. What that means to you is that they wrap around the face for maximum coverage and protection from wind, water, sand, or dirt. The G-12 lens uses a dark grey tint to block 88% of visible light, designed for use in bright, full sun conditions. Polarized versions are treated with Glare 86 Polarizing for a large reduction in glare on the field.