Costa Del Mar C-Line Adjustable Retainer – 20in, Black Sunglasses Strap

Keep your Costa Del Mar sunglasses ready for wherever the day takes you. The Costa C-Line Adjustable Retainer is designed to be ultra-light and unobtrusive, so you can move from boat decks to city streets without worrying about misplacing your frames. Its minimalist profile rests softly behind your ears, while a coated wire carries a quiet strength that feels dependable in active moments. The 20-inch length offers versatility, and the adjustable bead sliders let you tailor the fit as you change activities or weather. This retainer is aligned with Costa's water-inspired heritage and durable craftsmanship, making it a practical companion for shorelines, docks, and daily commutes.

Key design features

• Ultrathin, lightweight coated wire delivers a barely-there feel
• Adjustable bead sliders provide a precise, personal fit
• 20" end-to-end length offers versatile wearing options
• Compatible with all Costa sunglasses for hassle-free use
• Minimalist design that complements the Costa aesthetic while staying durable

Real-world use cases

• On a breezy pier or deck, the retainer keeps frames secure without bulk
• While hiking coastal trails, the slim profile stays out of the way during quick bends
• Running errands or commuting, it reduces the chance of misplacing glasses in bags or car consoles
• During water activities, the adjustable fit remains comfortable if you change head position or wear a hat

Materials, warranty and authenticity

When purchased from authorized sellers, Costa products are eligible for the brand’s warranty coverage and official support. This retainer pairs with Costa sunglasses through its practical design and reliable construction, reflecting the brand’s 40-year heritage of crafting eyewear for water and land adventures.

Whether you spend weekends on boats, beachside strolls, or daily outdoor routines, the Costa C-Line Adjustable Retainer offers a flexible solution to keep your frames within reach. It’s a simple accessory with the potential to enhance your everyday eyewear experience, without adding bulk or compromising style.