Exchange r, a round-lens shape extension of the best-selling exchange eyeglass featuring oakley’s heritage-inspired b1b grip textured unobtainium® earsocks. The lightweight o matter™ front and stainless-steel temples are designed to provide all-day comfort while the earsocks help keep the eyewear securely in place. Get a complete oakley pair when you order with oakley® authentic prescription lenses which come laser etched with the iconic ellipse logo for proof of authenticity and quality.