BACK TO BASICS. At its core, the Nike Vital Core delivers comfort, style, and ease in perfect harmony. Seamlessly blending modern aesthetics with a classic square design, it offers versatility that feels inherently true to your original style. BENEFITS Nike Max optics provide precise vision from all angles 4-base flat lens and slim profile provide everyday coverage PRODUCT DETAILS Injected frame material is derived from at least 40% castor bean oil 100% UVA/UVB protection