Blackfin Aero Loop B4-P2 is a rimless optical frame crafted from aerospace-grade titanium, engineered for an ultra-light, comfortable fit and featuring a patented lens connection for a minimalist look. Key attributes: Blue | Shiny oxide azure | Titanium | Ultra-lightweight | Hypoallergenic | Biocompatible and nickel-free | Durable aerospace-grade construction | Patented rear-mounted lens connection | Adjustable patented temple tips | Ultra-flexible titanium temples | Includes hard foldable case and soft microfiber pouch | Rimless three-piece design | Forged front components from a single block of titanium | Hinge inspired by aeronautical rivets | Hand-polished details and minimalist profile | Dimensions & fit: Size: B4 | Frame size: 150 | Weight: 2.9 g | Adjustable fit with patented temple tips | Ultra-lightweight feel with secure facial adhesion | Composition & care: Titanium