11D - Grey Black Stripe - Neutral Grey
Maui Jim KAIWI CHANNEL MJ840 Sunglasses
$209.06

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Maui Jim KAIWI CHANNEL MJ840 Sunglasses

11D - Grey Black Stripe - Neutral Grey

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DESCRIPTION RATINGS & REVIEWS PRESCRIPTION GUIDE

The Maui Jim KAIWI CHANNEL MJ840 Sunglasses are built for water sports enthusiasts who demand serious glare protection and optical clarity. Named after the challenging channel separating Oahu and Molokai, these wrap-style sunglasses deliver the performance you need whether you're paddling, fishing, or simply enjoying time on the water.

SuperThin Glass Lenses with PolarizedPlus2 Technology

The Kaiwi Channel features Maui Jim's SuperThin Glass lenses—32% thinner and lighter than standard glass while providing the absolute crispest optics available. These lenses offer superior scratch and solvent resistance, essential for saltwater environments. The patented PolarizedPlus2 technology eliminates 99.9% of glare, blocks 100% of harmful UV rays, and enhances color with a blend of rare earth elements that boost reds, greens, and blues. Every lens includes anti-reflective coating, oleophobic treatment for water and oil resistance, and protection against high-energy visible (HEV) blue light.

"Optics are sensational. Polarized lenses are beyond belief." — Tommy Bahama customer review

Designed for Water and Built to Last

The triple-injected nylon frame construction provides durability without bulk. A saddle-style bridge with embedded rubber nose pads and non-slip temple tips ensure a secure, comfortable medium fit (62mm lens width, 16mm bridge, 123mm temple) even during active use. The 8-base curve wrap design blocks peripheral light and glare bouncing off the water at harsh angles. Spring hinges add flexibility and long-term durability. Available in four distinctive stripe patterns with matte finishes—Grey Black Stripe, Burgundy Stripe, Dark Brown Stripe, and Blue Black Stripe—each paired with performance lens tints including Neutral Grey for bright conditions, HCL Bronze for everyday versatility, Blue Hawaii mirror, and Hawaii Lava mirror.

Prescription-Ready Performance

The Kaiwi Channel is available with prescription lenses through authorized optical retailers. Maui Jim offers 96% of their sunglasses in prescription, using MauiBrilliant, Polycarbonate, or MauiEvolution lens materials to accommodate most prescriptions while maintaining PolarizedPlus2 benefits. These sunglasses are recommended by the Skin Cancer Foundation as an effective UV filter for the eyes and surrounding skin, and they're saltwater-safe and corrosion-resistant—just rinse with filtered water after use.

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Maui Jim KAIWI CHANNEL MJ840 Sunglasses

Frequently Asked Questions

Are Maui Jim KAIWI CHANNEL sunglasses available with prescription lenses?

Yes, the Kaiwi Channel can be fitted with prescription lenses through authorized Maui Jim optical retailers. You can choose from MauiBrilliant, Polycarbonate, or MauiEvolution lens materials in various Maui Jim lens colors. Since prescription lenses are considered a medical device, they must be dispensed through a licensed eye care professional's office.

What size fit do the Kaiwi Channel MJ840 sunglasses offer?

The Kaiwi Channel offers a medium fit with measurements of 62mm lens width, 16mm bridge, and 123mm temple length. The frame width is approximately 130mm, making them suitable for small to medium fit for men and a medium fit for women. The wrap design with non-slip nose and temple pads provides a secure fit during active use.

What is Maui Jim's PolarizedPlus2 lens technology?

PolarizedPlus2 is Maui Jim's patented lens technology that eliminates 99.9% of glare, blocks 100% of harmful UV rays, and enhances color using a blend of three rare earth elements. The technology boosts reds, greens, and blues for vivid color and improved depth perception. All lenses include anti-reflective coating, scratch resistance, and oleophobic treatment that repels water and oil.

What are SuperThin Glass lenses and why are they better?

SuperThin Glass lenses provide the absolute crispest optics available from Maui Jim—32% thinner and lighter than standard glass. They offer superior scratch and solvent resistance, making them ideal for water sports and harsh environments. Despite being glass, they're surprisingly lightweight and provide better optical clarity than polycarbonate alternatives.

Are these sunglasses good for water sports and fishing?

Yes, the Kaiwi Channel is specifically designed for water sports. The wrap design blocks peripheral glare, the non-slip nose and temple pads keep them secure during activity, and the lenses are saltwater-safe and corrosion-resistant. The PolarizedPlus2 polarization eliminates surface glare from water, and the oleophobic coating makes water bead up and roll off the lenses.

What lens color options are available for the Kaiwi Channel?

The Kaiwi Channel is available in four lens options: Neutral Grey (highest light reduction for bright sunlight), HCL Bronze (warm tint for everyday use), Blue Hawaii (blue mirror coating), and Hawaii Lava (red mirror coating). Each lens color is paired with a complementary striped frame pattern—Grey Black, Dark Brown, Blue Black, or Burgundy Stripe.

Compare With Similar Frames

How the Maui Jim KAIWI CHANNEL MJ840 Sunglasses stacks up against the closest alternatives we carry.

Read the full comparison

Maui Jim KAIWI CHANNEL vs. Other Water Sports Sunglasses

If you're considering the Kaiwi Channel, you might also be weighing other Maui Jim wrap-style options designed for water sports. Here's how the Kaiwi Channel compares to three popular alternatives in our collection.

Kaiwi Channel vs. Local Kine MJ810

Both the Kaiwi Channel and the Local Kine MJ810 are wrap-style sunglasses built for water activities, and they're priced nearly identically. The key difference is coverage: the Local Kine features thicker temples that provide more peripheral protection, making it ideal if you're frequently facing harsh side glare. However, the Kaiwi Channel's sleeker profile and triple-injected nylon construction make it more versatile for both water sports and everyday wear. If you want maximum side coverage, go with the Local Kine. If you prefer a lighter, more streamlined wrap that transitions easily from boat to shore, the Kaiwi Channel is your best bet.

Kaiwi Channel vs. Peahi MJ202

The Peahi MJ202 is often cited by boating and fishing enthusiasts as having the best wrap coverage in the Maui Jim lineup. If blocking every bit of peripheral light is your top priority, the Peahi delivers. It's also slightly more expensive ($222–$249), reflecting its premium positioning. The trade-off? The Peahi's aggressive wrap design can look overly sporty for casual use and may not suit all face shapes. The Kaiwi Channel offers excellent wrap coverage with a more balanced, medium fit that works for a wider range of activities and face shapes. Choose the Peahi if you need absolute maximum coverage; choose the Kaiwi Channel for a better all-around performer.

Kaiwi Channel vs. Ho'okipa MJ407

The Ho'okipa MJ407 is a more affordable entry point into Maui Jim's water sports collection at $165–$181. It offers the same PolarizedPlus2 lens technology and UV protection, making it excellent value. However, the Ho'okipa has less wrap coverage and a simpler frame construction compared to the Kaiwi Channel's triple-injected nylon and embedded rubber pads. If you're on a tighter budget or prefer a less aggressive wrap, the Ho'okipa is a solid choice. But if you need a more secure fit for active water sports and want the enhanced durability of the Kaiwi Channel's construction, the extra investment is worthwhile.

Our recommendation: The Kaiwi Channel hits the sweet spot for most water sports enthusiasts—offering excellent wrap coverage, a secure medium fit, and premium SuperThin Glass optics at a competitive price. It's versatile enough for both serious water activities and everyday wear, making it a better all-around choice than more specialized or budget options.

At a Glance

Maui Jim LOCAL KINE MJ810 Sunglasses

Pros:

  • Classic wrap style with thick temples for added peripheral coverage
  • Similar price point ($200.08–$222.31)
  • Same PolarizedPlus2 lens technology and water-ready features
  • Excellent for blocking light from harsh angles on the water

Cons:

  • May have more coverage than some users prefer for everyday wear
  • Thicker temple design can feel bulkier than the Kaiwi Channel
  • Less variety in frame color options

Maui Jim PEAHI MJ202 Sunglasses

Pros:

  • Maximum wrap coverage—better than most Maui Jim models for blocking side light
  • Ideal for serious water sports and fishing
  • Same SuperThin Glass lens options with PolarizedPlus2 technology
  • Highly rated by boating and fishing enthusiasts

Cons:

  • Higher price point ($222.31–$249.16)
  • More aggressive wrap may not suit all face shapes
  • Can look too sporty for casual everyday wear

Maui Jim HO'OKIPA UNIVERSAL FIT MJ407 Sunglasses

Pros:

  • Lower price point ($165.0–$180.56)—best value in Maui Jim water sports lineup
  • Universal fit design accommodates a wider range of face shapes
  • Same PolarizedPlus2 lens technology and UV protection
  • Proven design that's been popular for years

Cons:

  • Less wrap coverage than the Kaiwi Channel
  • May not offer the same secure fit during high-intensity water sports
  • Simpler frame construction without the triple-injected nylon

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