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The Costa Del Mar Rincon II 9121 sunglasses represent a technical evolution of Costa's #1 best-selling frame, delivering enhanced functionality for anglers and outdoor enthusiasts who demand superior optics on the water. Named after California's legendary Rincon point break, this large-fit rectangular frame combines West Coast style with serious performance features that set it apart from standard sunglasses.
Costa 580 Lens Technology: Engineered for Water
Every Rincon II features Costa's multi-patented 580 lens technology, designed by in-house light spectrum experts specifically for fishing and water sports. The 580 designation refers to the wavelength of harsh yellow light the lens filters out—580 nanometers—which eliminates haze and enhances contrast on the water. These polarized lenses absorb 100% of harmful UV light and block high-energy visible (HEV) blue light known to cause eye fatigue and long-term damage. By filtering out yellow light, the lenses naturally boost reds, greens, and blues, giving you sharper color definition whether you're spotting fish or navigating changing tides.
The Rincon II is available with your choice of 580G glass lenses or 580P polycarbonate lenses. Glass lenses deliver superior optical clarity and are virtually scratch-proof thanks to Costa's encapsulated mirror technology, while remaining 20% thinner and 22% lighter than standard polarized glass. Polycarbonate lenses offer impact resistance and all-day comfort at a lighter weight, with Costa's C-Wall molecular bond coating providing extra scratch resistance and a barrier that repels water, oil, and sweat.
Rincon II Upgrades: Built for the Elements
Costa improved on the original Rincon with features that matter in real conditions. New micro side shields and hooding provide heightened coverage and minimal light leak, protecting your eyes from glare sneaking in from the sides. Vented nose pads increase airflow across the frame, reducing fogging when you move between air-conditioned cabins and humid decks. The double-injection rubber construction—replacing the original's spot-glued rubber—ensures the frame never delaminates, even after years of exposure to saltwater, sun, and sweat.
The frame itself is constructed from bio-based nylon that's lightweight, durable, and maintains its shape in extreme heat. Hydrolite rubber grips on the nose pads and temple tips actually get tackier as you sweat, keeping the sunglasses secure during active days. Integral spring hinges provide a flexible, comfortable fit. At a large/XL fit, the Rincon II works well for those who need generous coverage or have struggled to find performance sunglasses that fit properly.
Prescription-Ready Performance
The Rincon II is prescription-ready, accepting single-vision and progressive lenses with the same 580 polarized technology. The 6-base curve makes it an Rx-friendly design that can accommodate a wide range of prescriptions without optical distortion. Whether you need them for fishing, boating, beach days, or everyday driving, these sunglasses deliver the clarity and protection serious outdoor enthusiasts expect from Costa Del Mar.
Product Details
Product DetailsModel
06S9121Shape
Gender
Material
Bridge Type
Rim Type
Age Group
Color Details
Color DetailsColor Code
912109Color Description
Matte Smoke CrystalLens Color
Blue MirrorLens Features
polarized
Frame Color
BlackColor Code
912104Color Description
Matte BlackLens Color
Green MirrorLens Features
polarized
Frame Color
BlackColor Code
912101Color Description
Matte BlackLens Color
GrayLens Features
polarized
Frame Color
BlackColor Code
912102Color Description
Matte BlackLens Color
Blue MirrorLens Features
polarized
Color Code
912113Color Description
Deep Water CamoLens Color
Blue MirrorLens Features
polarized
Frame Color
TortoiseColor Code
912110Color Description
Matte TortoiseLens Color
Green MirrorLens Features
polarized
Color Code
912108Color Description
Matte Smoke CrystalLens Color
Green MirrorLens Features
polarized
Frame Color
BlackColor Code
912106Color Description
Matte BlackLens Color
GrayLens Features
polarized
Frame Color
BlackColor Code
912107Color Description
Matte BlackLens Color
Gold MirrorLens Features
polarized
Frame Color
TortoiseColor Code
912111Color Description
Matte TortoiseLens Color
GrayLens Features
polarized
Frame Color
BlackColor Code
912103Color Description
Matte BlackLens Color
Blue MirrorLens Features
polarized
Frame Color
BlackColor Code
912105Color Description
Matte BlackLens Color
Green MirrorLens Features
polarized
Frame Color
TortoiseColor Code
912112Color Description
Matte TortoiseLens Color
Gold MirrorLens Features
polarized
Frame Color
BrownColor Code
912115Color Description
Matte Brown SmokeLens Color
GrayLens Features
polarized
Color Code
912117Color Description
Polished ClearLens Color
Gray Silver MirrorLens Features
polarized
Frame Color
CopperColor Code
912118Color Description
Matte Terra CottaLens Color
Gold MirrorLens Features
polarized
Color Code
912121Color Description
Translucent 250th BlueLens Color
Blue MirrorLens Features
polarized
Color Code
912122Color Description
Matte Translucent SitkaLens Color
GrayLens Features
polarized
Size Details
Size DetailsBridge Width
11.00Temple Length
134.00Size
6411-134
Bridge Width
11.00Temple Length
134.00Size
6411-134
Bridge Width
11.00Temple Length
134.00Size
6411-134
Bridge Width
11.00Temple Length
134.00Size
6411-134
Bridge Width
11.00Temple Length
134.00Size
6411-134
Bridge Width
11.00Temple Length
134.00Size
6411-134
Bridge Width
11.00Temple Length
134.00Size
6411-134
Bridge Width
11.00Temple Length
134.00Size
6411-134
Bridge Width
11.00Temple Length
134.00Size
6411-134
Bridge Width
11.00Temple Length
134.00Size
6411-134
Bridge Width
11.00Temple Length
134.00Size
6411-134
Bridge Width
11.00Temple Length
134.00Size
6411-134
Bridge Width
11.00Temple Length
134.00Size
6411-134
Bridge Width
11.00Temple Length
134.00Size
6411-134
Bridge Width
11.00Temple Length
134.00Size
6411-134
Bridge Width
11.00Temple Length
134.00Size
6411-134
Bridge Width
11.00Temple Length
134.00Size
6411-134
Bridge Width
11.00Temple Length
134.00Size
6411-134
I place a sunglasses order which said would ship in a few business days. Three weeks later they showed up and it wasn’t even the correct pair. I sent them back for an exchange going on 2 weeks now and I can’t even get an email response on the status. I would not recommend this place no matter how good the prices are. Buyer beware!!
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Frequently Asked Questions
Are the Costa Rincon II sunglasses prescription-ready?
Yes, the Costa Rincon II 9121 is prescription-ready and can accommodate single-vision and progressive prescription lenses. The frame's 6-base curve design makes it particularly Rx-friendly, allowing for a wide range of prescriptions while maintaining the same 580 polarized lens technology that filters harmful blue light and enhances color contrast.
What's the difference between Costa 580G and 580P lenses?
580G lenses are made of glass and provide superior optical clarity and scratch resistance, being 20% thinner and 22% lighter than standard polarized glass. 580P lenses are polycarbonate-based, offering lighter weight, greater impact resistance, and a lower price point (typically $50 less). Both lens types feature the same 580 technology that filters harmful blue light and enhances colors, so the choice comes down to whether you prioritize absolute clarity (580G) or all-day comfort and durability (580P).
How does the Rincon II differ from the original Rincon?
The Rincon II is a technical evolution of Costa's best-selling Rincon frame with several key upgrades: new micro side shields and hooding for better coverage and minimal light leak, vented nose pads to reduce fogging, and double-injection rubber construction (replacing spot-glued rubber) that ensures the frame never delaminates. The Rincon II maintains the same large fit and West Coast aesthetic while adding more functionality for serious water use.
What size fit is the Costa Rincon II?
The Costa Rincon II has a large/XL fit, making it ideal for those with wider heads or anyone who wants generous lens coverage. The frame width is approximately 137mm, which translates to a men's large and women's large to extra-large fit. Many customers specifically choose the Rincon II because it's one of the few high-performance frames that fits comfortably on larger faces.
Do Costa Rincon II sunglasses have UV protection?
Yes, all Costa Rincon II sunglasses provide 100% UV protection, blocking 100% of UVA, UVB, and UVC light. The 580 lens technology goes beyond standard UV protection by also filtering out harmful high-energy visible (HEV) blue light, which can cause long-term eye damage and contributes to macular degeneration. The lenses are also fully polarized to eliminate reflected glare from water, pavement, and other surfaces.
Are Costa Rincon II sunglasses good for fishing?
Yes, the Rincon II is specifically designed for fishing and water sports. The 580 lens technology was developed by Costa's in-house light spectrum experts to cut through glare on the water and enhance the colors that matter most for spotting fish—reds, greens, and blues. The polarized lenses eliminate reflected glare, the vented nose pads reduce fogging, and the Hydrolite rubber grips keep the sunglasses secure even when wet. Many anglers consider Costa's 580 lenses among the best available for serious fishing.
Compare With Similar Frames
How the Costa Del Mar Rincon Ii 9121 Sunglasses stacks up against the closest alternatives we carry.
- Same large/XL fit and rectangular shape as Rincon II
- Proven design that's been Costa's #1 best-seller for years
- Features Costa 580 lens technology with full UV protection
- Same West Coast-inspired rectangular design as Rincon II
- Medium fit (frame width ~131mm) works for average-sized faces
- Features Costa 580 lens technology and full polarization
- Costa 580 lens technology with full UV protection and polarization
- Rectangular frame design suitable for fishing and water sports
- Bio-based nylon construction with Hydrolite rubber grips
Read the full comparison
Costa Rincon II vs. Original Rincon vs. Rinconcito: Which Rincon Is Right for You?
Costa's Rincon family offers three distinct options, each designed for different face sizes and preferences while sharing the same West Coast-inspired aesthetic and 580 lens technology.
Rincon II 9121: The Technical Evolution
The Rincon II represents Costa's latest refinement of their best-selling frame. It maintains the large/XL fit (137mm frame width) that made the original Rincon popular with anglers who need generous coverage, but adds meaningful technical upgrades. The new micro side shields and hooding minimize light leak from the periphery—critical when you're on the water in full sun. Vented nose pads increase airflow to reduce fogging when moving between air-conditioned spaces and humid outdoor conditions. Most importantly, the double-injection rubber construction eliminates the delamination issues that could affect the original Rincon's spot-glued rubber after years of saltwater exposure.
Choose the Rincon II if you want the most advanced version of this proven design, especially if you fish in demanding conditions where fogging and durability matter. The upgrades justify the investment for serious anglers and boaters.
Original Rincon 9018: The Proven Classic
The original Rincon earned its status as Costa's #1 best-seller for good reason. It offers the same large fit, bio-based nylon frame, Hydrolite rubber grips, and 580 lens technology as the Rincon II, but without the newer technical features. For many users, the original Rincon provides everything they need at a lower price point. If you don't fish in conditions where fogging is an issue and you take good care of your sunglasses, the original Rincon remains an excellent choice.
Choose the original Rincon if you want the proven design at the best value, or if you prefer the classic version without the additional features.
Rinconcito 9016: The Medium Fit Alternative
The Rinconcito brings the Rincon's style and performance to a medium fit (131mm frame width) that works for average-sized faces. It features the same rectangular shape, 580 lens technology, and bio-based construction, but in a more compact package. The 6-base curve makes it particularly Rx-friendly for prescription wearers. The smaller lens size also means lighter overall weight for all-day comfort.
Choose the Rinconcito if you love the Rincon aesthetic but need a medium fit, or if you prioritize lighter weight and a lower price over maximum coverage.
The Bottom Line
All three frames deliver Costa's exceptional 580 lens technology with full UV protection, polarization, and color enhancement. The Rincon II offers the most advanced features for demanding use, the original Rincon provides proven performance at the best value, and the Rinconcito brings the same quality to a smaller fit. Your choice comes down to fit preference, budget, and whether the Rincon II's technical upgrades matter for how you use your sunglasses.
At a Glance
Costa Del Mar Rincon 9018 Sunglasses
Pros:
- Same large/XL fit and rectangular shape as Rincon II
- Proven design that's been Costa's #1 best-seller for years
- Features Costa 580 lens technology with full UV protection
- Bio-based nylon frame with Hydrolite rubber grips
- Typically available at a lower price point than Rincon II
Cons:
- Lacks the Rincon II's micro side shields and hooding for enhanced coverage
- Uses spot-glued rubber instead of double-injection (can delaminate over time)
- No vented nose pads, making it more prone to fogging
- Older design without the technical improvements of the Rincon II
Costa Del Mar Rinconcito 9016 Sunglasses
Pros:
- Same West Coast-inspired rectangular design as Rincon II
- Medium fit (frame width ~131mm) works for average-sized faces
- Features Costa 580 lens technology and full polarization
- 6-base curve makes it extremely Rx-friendly for prescriptions
- Lighter overall weight due to smaller lens size
- Lower price point than the larger Rincon models
Cons:
- Medium fit may not provide enough coverage for larger faces
- Smaller lenses offer less peripheral protection from sun and glare
- Not ideal for those who specifically need a large/XL fit
- May lack some of the Rincon II's technical upgrades depending on model year
Costa Del Mar Brine 9017 Sunglasses
Pros:
- Costa 580 lens technology with full UV protection and polarization
- Rectangular frame design suitable for fishing and water sports
- Bio-based nylon construction with Hydrolite rubber grips
- Prescription-ready for single-vision and progressive lenses
- Similar price range to Rincon II ($153.75–$285.00)
Cons:
- Different frame shape and aesthetic than the Rincon II
- May have different fit characteristics (not the same large/XL sizing)
- Doesn't have the Rincon II's specific heritage tied to California surf culture
- May lack some of the Rincon II's technical features like vented nose pads