Blackfin Aero Loop Optical Frame is a rimless eyeglass frame crafted from aerospace-grade titanium, featuring a patented rear-mounted lens connection for an ultra-light, highly adjustable fit. Key attributes: Green | Army dark green | Aerospace-grade titanium | Ultra-lightweight | Hypoallergenic | Durable | Biocompatible | Nickel-free | Patented rear-mounted lens connection | Ultra-flexible titanium temples | Adjustable temple tips | Supplied with hard case and soft microfiber pouch | Rimless silhouette | Hand-polished details | Aeronautical rivet-inspired hinge | Minimalist, invisible design | Dimensions & fit: Weight 3.4 g | Size 150 | Size 0 | B4 | Adjustable fit via patented temple tips | Ultra-lightweight for comfortable all-day wear | Minimalist rimless design adapts to facial contours