The Oakley Exchange R is a round-lens eyeglass, an extension of the best-selling Exchange style. It features Oakley’s heritage-inspired B1B grip textured Unobtainium® earsocks for a secure fit. The lightweight O Matter™ front and stainless-steel temples are designed for all-day comfort. Enhance your eyewear with Oakley® Authentic Prescription lenses, laser etched with the iconic ellipse logo for proof of authenticity and quality. This model, OX8184 818402, comes in a Grey colour family and has a medium size with a full frame. The frame width is 141mm and the height is 48mm, with a temple width of 16mm.