Weighing in at only 36 g, PeriOptix's elegant and streamlined Micro TTLs are one of the lightest loupe systems ever developed. The proprietary compact lens design sacrifices nothing but weight, and the field of view and image quality are similar to those of larger and heavier loupes. They are available on the new Adidas sports frames with prescription capability. For more information, call (888) 360-0033 or visit perioptix.com.