Ray-Ban RB3721 188/13 Sunglasses pair a slim metal square frame with brown gradient lenses for reliable sun protection and a modern aviator-inspired silhouette. Designed for everyday wear, they balance classic styling with precise fit details. Key attributes: Brown | Gunmetal | Metal | Gradient lenses | Category 3 (high sun) lens | UV protection | Adjustable nose pads | Lightweight metal frame | Square frame | Double bridge | Thin metal temples | Dimensions & fit: Lens width 59 mm | Bridge 17 mm | Temple length 145 mm | Lens height 44.5 mm | Standard face coverage | Geofit fit | Composition & care: Metal frame | Gradient brown lenses | Wipe lenses with a microfiber cloth. Store in a protective case when not in use. Avoid abrasive cleaners and prolonged exposure to heat or chemicals.