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Cut the glare off the water wearing classic Costa Del Mar Fathom Sunglasses.

The Costa Del Mar Fathom Polarized Sunglasses give you the visual clarity of polarized glass lenses in a comfortable, classic-fit frame. The Costa 400 glass lenses are lightweight, durable,scratch-resistant and polarized to give you optimum vision on the water or trail. Keep these sunglasses handy because you will want to wear them all the time.

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Costa Fathom Polarized Sunglasses - Costa 400 Glass Lens

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What are the measurements?

Responded on


Temple Length: 123 mm
Frame Width: 140 mm
Lens Height: 40 mm
Lens Width: 60 mm
Bridge: 13 mm

Unanswered Question

I wanted to ask if the fathom 400 has been...

I wanted to ask if the fathom 400 has been discontinued please.

5 5

Awesome glasses for fishing & skiing

This is my favorite pair of sun glasses. I usually use the blue mirrored for deep sea fishing and also skiing. Slightly bigger than the Wave Killer. They fit great, sturdy and I also put r/x's in them.

Highly recommend.

5 5

Love the Fathoms

Best pair of sunglasses I've ever worn. I was relunctant to spend so much money for sunglasses, but after trying a pair, I can't imagine going back. The glass lenses are so clear. These are very comfortable. I sometimes forget I have them on. I was able to get them at a good price at I highly recommend the Fathoms!

5 5

Great shades

I got a pair of these the other day and I love them! They make everything so vibrant, and i can look in the general area of the sun without squinting much.
Costas are wonderful!

Write your question here...Can I get the...

Write your question here...Can I get the Fathom Polarized Sunglasses in the 580 lens? Thanks Tony

5 5

Costa Fathoms

These sunglasses are amazing. I have used them from the coast of the USVI to the top of Whistler mountain and skiing in the back country. They have held up to many days and eves of drunken debauchery and a few sticky fingered girlfriends. They always seem to want to snag my shades. Anyhow if you are looking for and extremely lightweight, comfortable and durable pair of sunglasses these are it !! Not to mention Backcountry.coms amazing satisfaction guarantee.

do you have these with black frames? also...

do you have these with black frames? also compared to the hammerhead, are the lenses the same size? i've tried on the hammerheads, they fit my big head pretty well, are the fathom the same size? thanks, george

Responded on

The fathoms are a smaller lens than the Hammerheads, and the frame is much lower profile/coverage. This is a medium lens size with a lightweight thin frame, whereas the Hammerheads are large lenses with a very large wraparound frame. Hammerheads are great at peripheral light blocking. You might look at the Man-o-war for a larger Costa with good coverage.