Costa Del Mar Mag Bay Polarized Sunglasses
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Built for the Big Water
The Costa Mag Bay takes its name from Magdalena Bay, the mangrove-fringed estuary on the Pacific coast of Baja where sport fishing is legendary and the horizon always seems a little bigger. Costa designed these sunglasses to match that scale: an XL, large-fit frame engineered for anglers and on-water adventurers who need performance optics that keep pace with demanding conditions, all day long.
Costa 580 Polarized Lens Technology
The Mag Bay is fitted with Costa's 580P polycarbonate lens, the workhorse of the 580 family. The 580 spectrum designation means the lens cuts high-energy blue light and blocks the specific yellow wavelengths that wash out contrast on the water, while enhancing the reds and greens that help anglers read structure, baitfish, and depth changes at a glance. Polycarbonate construction keeps the lens impact-resistant and lightweight, so the frame stays comfortable across a full day on the water without fatigue.
All 580P lenses are 100% polarized to eliminate glare off flat water, waves, and wet decks. The Base 8 Decentered curve wraps the lens close to the face, reducing peripheral glare and improving the optical field without the distortion that comes from a poorly curved lens.
Frame Construction and Fit
The Mag Bay frame is built to a Regular fit in a large silhouette, giving the coverage that serious on-water use demands. There is no adjustable nosepad, which keeps the profile clean and eliminates moving parts that can loosen over time. Costa's frames are made from bio-based nylon that resists salt, UV degradation, and the thermal cycling of being left in a boat or a truck. The hinges are co-injected to stay tight across years of daily use.
Performance Details
- Polarized 580P polycarbonate lenses eliminate glare and enhance water-reading contrast
- Base 8 Decentered lens curve for a wide, distortion-free optical field
- XL large-fit frame with generous coverage for on-water and outdoor use
- Regular frame fit, no adjustable nosepad for a streamlined, reliable profile
- 100% UVA/UVB protection
- Lightweight polycarbonate lens construction for all-day comfort
- Salt and UV-resistant frame material
Why the Mag Bay Belongs in Your Rotation
Most performance sunglasses compromise somewhere: lens quality, coverage, or weight. The Mag Bay does not pick one. The 580P optics deliver professional-grade color enhancement that makes a real difference when you are reading the water, the large-fit frame provides coverage that keeps stray light out, and the polycarbonate lens keeps the weight down. Whether you are deep-sea fishing, paddling, or just spending the day on the water, the Mag Bay handles the conditions without asking you to adjust for them.
Shop the Mag Bay at Island Water Sports
The Costa Mag Bay is available in store and online at Island Water Sports. Our South Florida team lives and fishes on the same water you do and can help you match the right lens tint to your conditions. Questions? Call us at 954-427-4929.
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Specifications
- Brand
- Costa Del Mar
- Model
- Mag Bay
- Lens Material
- Polarized Polycarbonate (580P)
- Lens Technology
- Costa 580 Spectrum
- Lens Curve
- Base 8 Decentered
- Polarization
- Yes, 100% polarized
- UV Protection
- 100% UVA/UVB
- Frame Fit
- Regular
- Frame Size
- XL
- Nosepad Adjustable
- No
- Gender
- Men's
- Intended Use
- Fishing, on-water, outdoor sport
Frequently Asked Questions
- Are the Costa Mag Bay sunglasses polarized?
- Yes. Every Mag Bay lens is 100% polarized. The 580P polycarbonate lens eliminates surface glare off water, decks, and wet surfaces while the 580 spectrum filter enhances color contrast to help you read the water more effectively.
- What is the difference between Costa 580P and 580G lenses?
- Both share the same 580 spectrum lens technology that cuts blue light and enhances contrast for on-water use. 580P lenses are made from polycarbonate: lighter, more impact-resistant, and better suited to high-activity use. 580G lenses are made from glass: optically sharper and more scratch-resistant, but heavier. The Mag Bay is offered in both lens materials; the right choice depends on whether you prioritize weight and durability or maximum optical clarity.
- What does the Costa 580 lens do?
- The 580 designation refers to Costa's proprietary spectrum control technology. The lens blocks high-energy visible blue light (below 580nm) and filters the yellow wavelengths that cause eye fatigue and wash out contrast on water, while letting through the reds and greens that make underwater structure, fish, and depth changes easier to see.
- Can I get replacement lenses for the Costa Mag Bay?
- Yes. Costa offers replacement lenses for the Mag Bay through their warranty and lens replacement program. If you need help sourcing replacement lenses, contact Island Water Sports at 954-427-4929 and our team can point you in the right direction.
- What is the fit like on the Costa Mag Bay?
- The Mag Bay is built on an XL frame in a Regular fit. The frame is large by design, providing broad coverage for on-water and outdoor use. The nosepad is fixed rather than adjustable, which keeps the profile clean and eliminates hardware that can work loose over time.
- Are the Costa Mag Bay sunglasses good for fishing?
- Yes, and that is exactly what they were designed for. The Mag Bay is named after a legendary sport fishing destination, and the 580P polarized lenses are built to eliminate glare and enhance the color contrast anglers need to read the water. The large-fit, XL frame provides coverage that keeps peripheral light from washing out the view.
- Where can I buy the Costa Mag Bay in South Florida?
- The Costa Mag Bay is available at Island Water Sports in South Florida, both in store and online. Reach our team at 954-427-4929 for availability and recommendations.