Costa Del Mar Fly Line 9129 Sunglasses

The Costa Del Mar Fly Line 9129 sunglasses deliver serious fishing performance wrapped in a modern, versatile design. Built for anglers, boaters, and outdoor enthusiasts who spend long days on the water, these polarized sunglasses combine Costa’s proven 580 lens technology with a wraparound frame inspired by the brand’s best-selling Reefton model—at a price point that won’t break the bank.

Costa 580 Lens Technology: See More, Fish Better

Every pair of Fly Line sunglasses features Costa’s proprietary 580 lens technology, a multi-patented system designed by light spectrum experts to enhance color and contrast beyond standard polarization. The 580 lenses filter out harsh yellow light at 580 nanometers while blocking 100% of UV light and harmful high-energy visible (HEV) blue light. The result? Reds, greens, and blues pop naturally, giving you sharper contrast and higher definition—critical advantages when you’re scanning flats for tailing redfish or tracking a bass in murky water.

The lenses are protected by Costa’s C-Wall coating, a scratch-resistant barrier that repels water, oil, and sweat. Water beads and rolls off instead of clinging to the lens surface, so your view stays clear even in spray and humidity. Choose between 580G lightwave glass lenses for superior optical clarity and scratch resistance, or 580P bio-polycarbonate lenses for lighter weight and impact durability. Both deliver 99.9% polarization efficiency—among the best glare reduction available.

8-Base Wrap Frame & All-Day Comfort

The Fly Line features an 8-base curve wraparound frame that hugs your face and provides maximum coverage from sun, wind, and peripheral light. The rectangular shape (64mm lens width, 13mm bridge, 120mm temples) fits average to larger heads comfortably. Double-injected Hydrolite rubber grips the nose pads and temple tips, absorbing sweat and keeping the frames locked in place whether you’re leaning over the gunwale to land a fish or navigating choppy water. Retainer-ready temple tips let you attach any lanyard or strap to keep your sunglasses secure during active use.

The frames are made from durable injected acetate with a matte finish available in multiple colors, including classic Matte Black and Matte Tortoise. At 136mm frame width, the Fly Line offers a large fit with a regular frame profile—substantial coverage without feeling bulky.

Prescription-Ready Performance

The Costa Fly Line 9129 is prescription-ready, so you can add single-vision or progressive lenses and enjoy the same color-enhancing, glare-cutting performance with your exact prescription. This frame accepts a wide range of prescriptions, making it a practical choice for anglers who need vision correction on the water.

Available in 15 lens and frame combinations—from neutral Gray and versatile Blue Mirror to the new Rose lens designed for variable light conditions—the Fly Line adapts to your fishing style and environment. Whether you’re chasing stripers at dawn, sight-casting on bright flats, or exploring backcountry rivers, there’s a lens color optimized for your conditions.