Costa Del Mar Finlet Polarized Sunglasses
Built for Serious Water Time
The Costa Del Mar Finlet is an instrument first and a frame second. Engineered from the ground up for demanding on-water use, it combines full wraparound coverage with a purpose-driven construction that holds up wherever the adventure takes you. The aggressive 8 base wrap delivers a wide field of vision while pulling the lens close to the face, minimizing peripheral light bleed on open water or coastal flats.
The defining feature is the Finlet-inspired side shield, a structural element integrated directly into the frame that blocks stray light and wind from the sides. It is the same functional idea that makes a fish fin effective in turbulent water, translated into a sunglass frame. When glare, spray, and reflection are constant, those shields earn their place on every outing.
Costa 580G Polarized Glass Lenses
The Finlet ships with Costa's 580G polarized glass lenses, the top tier in their lens lineup. The 580 designation refers to the proprietary lens technology that removes the yellow-green portion of the spectrum (the band most responsible for visual fatigue on reflective water) while selectively transmitting red, blue, and green light. The result is a sharper, higher-contrast view through the water surface and across flats where most polarized lenses fall short.
Glass optics deliver superior scratch resistance and optical clarity compared to polycarbonate. The decentered Base 8 lens curve maintains optical precision at extreme wrap angles, eliminating the peripheral distortion that is common in aggressive sport frames. UV400 protection is inherent in the 580G glass construction, blocking 100% of UVA and UVB radiation.
Frame Construction and Fit
The Finlet frame is built with double-injected Hydrolite material at all contact points. Hydrolite is Costa's proprietary rubber compound that becomes more grippy when wet, which matters on the water when heat and spray work against every other grip material. The double-injection process bonds Hydrolite directly to the frame substrate so it cannot peel or delaminate over time.
Temple tips are retainer-ready, meaning they are shaped to accept standard sunglass retainers without any modification. If you are paddling, diving, or running rough water, you can affix any retainer of your choice and keep the frame on your face without compromising the design.
Why Costa Del Mar
Costa Del Mar is an American company that has built polarized performance optics since 1983, focused entirely on the needs of anglers, divers, and water sports athletes. Every frame in their lineup is designed around one use case: seeing better on and around water. The Finlet represents their sport-performance tier, pairing maximum coverage with the optical performance of 580G glass for those who spend serious time in the elements.
Shop the Costa Del Mar Finlet at Island Water Sports, available in store and online in South Florida.
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Specifications
- Model
- Finlet
- Item Number
- 6S9118 911801 59-19
- Lens Material
- Polarized Glass (580G)
- Lens Curve
- Base 8 Decentered
- Polarization
- Yes
- UV Protection
- UV400 (100% UVA and UVB)
- Frame Material
- Double-Injected Hydrolite
- Side Shields
- Yes, Finlet-inspired integrated shields
- Retainer-Ready Temple Tips
- Yes
- Frame Fit
- Large (L)
- Gender
- Men's
- Brand
- Costa Del Mar
Frequently Asked Questions
- Are Costa Finlet sunglasses polarized?
- Yes. Every Costa Del Mar Finlet comes with polarized 580G glass lenses. The polarization filter eliminates horizontal glare reflected off water surfaces, and the 580 technology further enhances contrast and color definition compared to standard polarized glass.
- What are the side shields on the Costa Finlet?
- The Finlet features Finlet-inspired integrated side shields built directly into the frame at the temple area. They block peripheral light and wind from the sides, providing extra coverage beyond what a standard wrap frame offers. The design takes its name from the fin shape and performs the same function: cutting through turbulent conditions.
- What is Costa 580G glass?
- 580G is Costa's top-tier glass lens technology. The 580 refers to their proprietary spectrum-management process that blocks the yellow-green band of light (the primary cause of eye fatigue on water) while transmitting enhanced red, blue, and green. The G designates actual glass construction, which provides superior scratch resistance and optical clarity versus polycarbonate alternatives.
- Can I use a retainer strap with the Costa Finlet?
- Yes. The Finlet's temple tips are retainer-ready, shaped to accept any standard sunglass retainer without modification. This makes them practical for watersports, fishing, or any activity where you need the frame secured to your head.
- What does double-injected Hydrolite mean?
- Hydrolite is Costa's proprietary grip rubber compound, formulated to increase friction when wet rather than become slippery. Double injection means the Hydrolite is molded directly onto the frame substrate during manufacturing, bonding permanently so it cannot peel or delaminate the way adhesive-applied rubber can.
- Are Costa Finlet sunglasses good for fishing and watersports?
- Yes. The Finlet was specifically designed for on-water performance. The 8 base wrap and side shields minimize stray light and spray, the 580G polarized glass cuts water surface glare and improves underwater visibility, and the Hydrolite grip holds in humid and wet conditions. The retainer-ready tips allow you to secure the frame for active use.
- Where can I buy Costa Del Mar Finlet sunglasses?
- The Costa Del Mar Finlet is available at Island Water Sports in store and online. Island Water Sports is South Florida's destination for water sports gear and accessories.