Nike 4313 N 001 Optical Frame pairs a flexible Flexon metal construction with a sport-inspired rectangle silhouette. Designed for everyday wear and active use, it offers adjustable sizing options for a secure fit. Key attributes: Satin black | Flexon | Flexible Flexon frame | Sport-inspired performance design | Includes original Nike case | Available in two lens widths | Rectangle frame shape | Half-rim construction | Sport-inspired temples | Dimensions & fit: Size M: 52-17-145 mm | Size L: 54-17-145 mm | Composition & care: Flexon | Clean lenses with a microfiber cloth and lens cleaner; store frames in the supplied case.