Description: Hard Kore Sunglasses - Black The result of innovative materials and a "function first" focus, the Hard Kore is the ultimate performance sunglass. A testament to the companyâs commitment to Kore Performance design and engineering, the Hard Kore is the next evolution of the brandâs award-winning Kore model. This fresh design is lightweight, incredibly durable, and intuitively integrates with the natural form of the wearerâs head shape while accommodating different facial features.