Product Details
Color Details
Size DetailsFrequently Asked Questions
Are Costa Fathom sunglasses prescription-ready?
What is the difference between Costa 580P and 580G lenses?
What size head does the Costa Fathom fit?
Are Costa Fathom sunglasses good for fishing?
How durable are Costa Fathom sunglasses?
What lens color is best for the Costa Fathom?
Compare With Similar Frames
How the Costa Del Mar Fathom 9058 Sunglasses stacks up against the closest alternatives we carry.
- Slightly square retro frame shape offers a different aesthetic
- Medium to large fit accommodates wider faces
- Full Hydrolite temples for maximum grip
- Available with Costa 580 polarized lenses in multiple colors
- Different frame style for those seeking variety
- Prescription-ready like the Fathom
Read the full comparison
Costa Fathom vs Costa Brine: Which Fishing Sunglass Fits You?
Both the Costa Fathom 9058 and the Costa Brine 9017 are retro-styled fishing sunglasses from Costa's core collection, and both feature the same exceptional 580 lens technology with 99.9% polarization efficiency. The choice between them comes down to fit and frame shape.
Frame Shape & Style
The Fathom features slightly rounded oval edges that blend classic style with modern performance, while the Brine has a more square, angular retro look. Both offer full 8-base wrap coverage to reduce peripheral glare, but the aesthetic is noticeably different—the Fathom reads more contemporary, the Brine more vintage.
Fit & Sizing
This is the critical difference. The Fathom is designed for narrow to medium heads with a small lens front (61mm width) and high bridge fit. The Brine offers a medium to large fit that accommodates wider faces. If you have a narrow head or high nose bridge, the Fathom will provide a more secure, comfortable fit. If you need more coverage or have a wider face, the Brine is the better choice.
Grip & Comfort
Both models use Hydrolite nose pads and temple grips to prevent slippage when wet or sweating. The Brine features full Hydrolite temples for maximum grip during extreme fishing conditions, while the Fathom uses co-molded Hydrolite pads. Both are built to stay put during active use on the water.
Our Recommendation
Choose the Costa Fathom 9058 if you have a narrow to medium head, prefer a high bridge fit, and like the rounded oval frame shape. It's ideal for anglers who want a compact, secure fit that won't shift during active fishing. Choose the Costa Brine 9017 if you have a medium to large head, prefer a square retro look, and need more coverage. Both deliver the same world-class 580 lens performance—fit is the deciding factor.
Also consider the Costa Rincon 9018 if you want Costa's 580 technology in a different frame style with a similar price point.
At a Glance
Costa Del Mar Brine 9017 Sunglasses
Pros:
- Slightly square retro frame shape offers a different aesthetic
- Medium to large fit accommodates wider faces
- Full Hydrolite temples for maximum grip
- Same 580 lens technology and polarization as Fathom
Cons:
- Larger fit may not work for those with narrow heads
- Less rounded, more angular look compared to Fathom's oval shape
- Similar price point, so choice comes down to fit preference
Costa Del Mar Rincon 9018 Sunglasses
Pros:
- Available with Costa 580 polarized lenses in multiple colors
- Different frame style for those seeking variety
- Prescription-ready like the Fathom
- Similar price range ($179–$296)
Cons:
- Different fit profile may not suit those who prefer the Fathom's narrow fit
- Frame shape and coverage differ from the Fathom's wrap design