The Ray-Ban Kai Bio-Based (RB3757) is a unisex full-rim narrow oval — almost diamond-shaped — sunglass in lightweight metal. The pictured Gunmetal colorway pairs a polished silver-grey wire rim with polarized teal-grey lenses and red-brown acetate temple tips. Built on Ray-Ban's bio-based metal program. Compatible with prescription lenses, single-vision through progressive. Frame shape: Narrow oval (diamond contour) Rim style: Full-rim Frame material: Metal (bio-based) Gender: Unisex Size: Medium Measurements (56 mm / 59 mm): 56 or 59 mm lens · 34.2 or 36.1 mm height · 15 mm bridge · 145 mm temple · 127 or 133 mm total width Colors: Gunmetal, Gold, Silver Configurations: Non-prescription or Prescription, in 56 mm or 59 mm Lens options: Single Vision, Bifocal, Progressive Coating options: Blue Light, Photochromic, Anti-Reflective, Anti-Scratch
