Tired of visually struggling to tie knots on tiny hooks or read small-print maps while fishing? Well, great news! Guideline's crystal-clear polarized lenses come with smartly placed magnifiers. They're out of the way while fishing, but conveniently ready when you need them. The inner-lens bifocals virtually vanish when worn. The Mantis is the first, semi-rimless polarized bifocal ever offered, and features a lightweight Aluminum-Magnesium frame with all the options. Spring hinge temples provide added comfort and keep your glasses from slipping. The fully-adjustable nose pads allow for a custom fit while optimizing lens placement. The Mantis semi-rimless frame allows you to place the magnifier even lower than our already popular Guideline bifocals. The result is the ultimate in unobstructed polarized vision with convenient magnification. No more switching from fishing glasses to readers to tie that knot. The Mantis Bifocal can do it all.