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The Costa Del Mar Mainsail 9107 sunglasses bridge the gap between beach-lifestyle style and serious performance. Part of Costa's Hybrid Collection, these rectangular frames deliver the brand's legendary 580 lens technology in a design that transitions from the dock to everyday wear without missing a beat.
Costa 580 Lens Technology: Color and Clarity Engineered for Water
Costa's 580 lenses filter out harsh yellow light at 580 nanometers on the visible spectrum, allowing reds, greens, and blues to pop naturally. The result is enhanced contrast and definition that helps you spot structure below the surface or navigate bright conditions on land. All lenses are fully polarized with 99.9% polarization efficiency and block 100% of UV light (UVA, UVB, and UVC). The proprietary C-Wall coating adds scratch resistance and repels water, oil, and sweat for easy maintenance. Available in both 580G glass (superior clarity, slightly heavier) and 580P polycarbonate (lighter weight, impact-resistant) versions across multiple mirror and solid tints.
Hybrid Performance Features
The Mainsail 9107 measures 55mm lens width, 18mm bridge, and 136mm temple length—a large fit designed for average to wider faces with a high bridge fit. The bio-based nylon frame is lightweight and durable, built to handle temperature extremes. Vented Hydrolite nose pads promote airflow to reduce fogging while providing a secure, tacky grip that increases as you sweat. Double-injected Hydrolite on the temple tips keeps the frames locked in place during active use. Micro side shields and top hooding block peripheral light without the bulk of dedicated fishing frames, while integrated eyewire drains and sweat channels keep moisture out of your eyes. Spring hinges and retainer-ready temple tips add versatility for all-day wear.
"These aren't your sunglasses if you're a charter captain on the water everyday, but if you're someone who enjoys being outdoors and wants a pair of sunglasses you can wear to any occasion, these are for you." — BassGrab reviewer
The Mainsail is prescription-ready and compatible with Costa's Rx lens program for single vision and progressive prescriptions. With 12 color combinations ranging from matte black to tiger shark patterns with blue, green, gray, and rose mirror lenses, there's a look for every style and light condition. From $189, these frames deliver Costa's water-born DNA in a package refined enough for the street.
Product Details
Product DetailsModel
06S9107Shape
Gender
Material
Bridge Type
Rim Type
Age Group
Color Details
Color DetailsFrame Color
BlackColor Code
910706Color Description
BlackLens Color
Gray Silver Mirror
Color Code
910704Color Description
GreyLens Color
Green Mirror
Frame Color
BlackColor Code
910702Color Description
BlackLens Color
Green Mirror
Color Code
910705Color Description
GreyLens Color
Blue Mirror
Frame Color
BlackColor Code
910701Color Description
BlackLens Color
Blue Mirror
Frame Color
BlackColor Code
910703Color Description
BlackLens Color
Gray
Frame Color
BlackColor Code
910707Color Description
BlackLens Color
Gray
Frame Color
BlackColor Code
910708Color Description
Matte BlackLens Color
Gray 580pLens Features
polarized
Color Code
910709Color Description
Red SkyLens Color
Gray 580pLens Features
polarized
Frame Color
BlackColor Code
910713Color Description
Matte BlackLens Color
RoseLens Features
polarized
Color Code
910712Color Description
Deep Water CamoLens Color
Blue MirrorLens Features
polarized
Frame Color
TortoiseColor Code
910711Color Description
Matte TortoiseLens Color
Gold Mirror 580gLens Features
polarized
Color Code
910714Color Description
Matte Translucent SitkaLens Color
GrayLens Features
polarized
Size Details
Size DetailsBridge Width
18.00Temple Length
136.00Size
5518-136
Bridge Width
18.00Temple Length
136.00Size
5518-136
Bridge Width
18.00Temple Length
136.00Size
5518-136
Bridge Width
18.00Temple Length
136.00Size
5518-136
Bridge Width
18.00Temple Length
136.00Size
5518-136
Bridge Width
18.00Temple Length
136.00Size
5518-136
Bridge Width
18.00Temple Length
136.00Size
5518-136
Bridge Width
18.00Temple Length
136.00Size
5518-136
Bridge Width
18.00Temple Length
136.00Size
5518-136
Bridge Width
18.00Temple Length
136.00Size
5518-136
Bridge Width
18.00Temple Length
136.00Size
5518-136
Bridge Width
18.00Temple Length
136.00Size
5518-136
Bridge Width
18.00Temple Length
136.00Size
5518-136
Every thing came as ordered and love the glasses. Only issue was there is no clear time frame listed that includes the total processing time; just says it ships in like 7-10 days [paraphrase, but a quick expected shipped date]. I learned that they have to order it from a warehouse, wait for that shipment, then their own processing takes like 2 weeks, THEN it'll be shipped to you within that timeframe listed. Happy with the item just wish it would have been clearer on how long it would take prior to shipping.
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Frequently Asked Questions
Are Costa Mainsail 9107 sunglasses prescription-ready?
Yes, the Costa Mainsail 9107 is fully prescription-ready and compatible with Costa's Rx lens program. You can order them with single vision or progressive (multifocal) prescription lenses in 580P polycarbonate material. The frame's 6-base curve and rectangular shape make it an excellent candidate for prescription lenses, and the 55mm-18mm-136mm measurements accommodate most prescriptions.
What is the difference between Costa 580G and 580P lenses?
Costa 580G lenses are made from glass and offer superior optical clarity and better scratch resistance, though they're slightly heavier. Costa 580P lenses use polycarbonate, making them lighter weight and more impact-resistant. Both provide the same 580 color-enhancement technology, 99.9% polarization efficiency, and 100% UV protection—the choice comes down to whether you prioritize clarity (glass) or lighter weight (polycarbonate).
How does the Hydrolite grip on Costa Mainsail work?
Hydrolite is Costa's proprietary rubber material applied to the nose pads and temple tips of the Mainsail. It becomes tackier and more grippy as you sweat, preventing the frames from sliding during active use. The vented nose pads also promote airflow to reduce fogging. Reviewers note the grip is highly effective but can leave temporary marks on the nose bridge and may catch on long hair.
What size head do Costa Mainsail 9107 sunglasses fit?
The Mainsail 9107 has a "large" lens front (55mm width) designed for average to wider faces, with a high bridge fit that works best for those with a high nose bridge and lower cheekbones. The 136mm temple length and spring hinges provide flexibility. Costa classifies this as a regular/medium coverage frame. If you need more coverage, Costa offers the Mainsail XL for extra-large fits.
Are Costa Mainsail sunglasses good for fishing?
The Mainsail performs well for recreational fishing and water activities, with Costa's 580 polarized lenses that cut glare and enhance underwater visibility. However, they're designed as a hybrid lifestyle frame with less coverage than dedicated fishing models like the Fantail Pro. The micro side shields and top hooding block most light, but reviewers note they may let in peripheral light during extended time on bright water compared to full wrap fishing frames.
Do Costa Mainsail sunglasses come with UV protection?
Yes, all Costa Mainsail 9107 sunglasses provide 100% protection from UVA, UVB, and UVC light. The 580 lens technology also absorbs high-energy visible (HEV) blue light known to cause eye strain and long-term damage. The C-Wall coating adds scratch resistance and repels water, oil, and sweat. Every pair is fully polarized to eliminate reflective glare for superior light management.
Compare With Similar Frames
How the Costa Del Mar Mainsail 9107 Sunglasses stacks up against the closest alternatives we carry.
- Larger 63mm lens width for bigger faces and more coverage
- Classic West Coast straight bridge design with broader appeal
- Slightly lower starting price point ($179 vs $189)
- True medium fit (vs Mainsail's large fit for average heads)
- Lower starting price at $133.49
- Same Hydrolite nose pads and temple tips as Mainsail
- Similar hybrid design philosophy balancing style and function
- Slightly lower starting price at $181.73
- High bridge fit like the Mainsail
Read the full comparison
Costa Mainsail 9107 vs. Rincon vs. Rinconcito: Which Rectangular Frame Is Right for You?
Costa's rectangular frame lineup can be confusing, but the choice comes down to fit, coverage, and how much performance you need in a lifestyle package.
Size and Fit
The Rincon 9018 is the largest of the three with a 63mm lens width, designed for bigger faces or those who want maximum coverage. The Mainsail 9107 sits in the middle at 55mm—Costa calls it a "large" fit, but it's sized for average to wider heads. The Rinconcito 9016 is the true medium at around 60mm, best for smaller to average faces. All three offer high bridge fit, but the Mainsail and Rinconcito share the same Hydrolite grip technology on nose pads and temples.
Performance Features
This is where the Mainsail separates itself. The vented nose pads promote airflow to reduce fogging—a feature neither the Rincon nor Rinconcito offer. The Mainsail's micro side shields and top hooding block peripheral light without looking overly technical, while integrated sweat channels and eyewire drains keep moisture out of your eyes during active use. The Rincon and Rinconcito are more traditional lifestyle frames with Costa's excellent 580 lenses but fewer water-specific features.
Style and Versatility
The Rincon has the most classic West Coast look with its straight bridge and clean lines—it's been a bestseller for years. The Rinconcito shares that DNA in a more compact package. The Mainsail leans more technical with its subtle performance details, making it the best choice if you want one pair that works equally well on the boat, at the beach, or running errands. All three are prescription-ready and available with Costa's full range of 580G glass and 580P polycarbonate lenses.
Our Recommendation
Choose the Mainsail 9107 if you want hybrid performance features (vented pads, side shields, sweat management) in a frame that doesn't look overly sporty. It's the most versatile of the three for active outdoor use. Go with the Rincon 9018 if you have a larger face or simply want maximum coverage and a proven classic design. Pick the Rinconcito 9016 if you have a smaller face or prefer a lower price point and don't need the Mainsail's extra performance features. You can't go wrong with any of them—all three deliver Costa's world-class 580 lens technology and build quality.
At a Glance
Costa Del Mar Rincon 9018 Sunglasses
Pros:
- Larger 63mm lens width for bigger faces and more coverage
- Classic West Coast straight bridge design with broader appeal
- Slightly lower starting price point ($179 vs $189)
- More frame and lens color options available
Cons:
- Lacks the Mainsail's vented nose pads and sweat management channels
- No micro side shields or top hooding for light blocking
- Less refined for hybrid lifestyle/performance use
Costa Del Mar Rinconcito 9016 Sunglasses
Pros:
- True medium fit (vs Mainsail's large fit for average heads)
- Lower starting price at $133.49
- Same Hydrolite nose pads and temple tips as Mainsail
- 6-base curve makes it extremely Rx-friendly
Cons:
- No vented nose pads for airflow and fog reduction
- Lacks micro side shields and sweat management channels
- Less coverage and light blocking for water activities
Costa Del Mar Reefton 9007 Sunglasses
Pros:
- Similar hybrid design philosophy balancing style and function
- Slightly lower starting price at $181.73
- High bridge fit like the Mainsail
- Available in both 580G glass and 580P polycarbonate
Cons:
- Different frame shape may not suit all face types
- Less coverage from side shields and hooding
- Fewer color and lens combinations available