Our site is optimized for today's modern browsers. To fully benefit from our site's features, please download the latest version of either:   Firefox, Chrome, Opera, Safari or Internet Explorer



Product Information


Hard-core sunglasses for hard-core saltwater junkies. These co-injected co-molded frames combine perfect fit with the best polarized lenses on the planet to give you maximum comfort and vision on the water. A true sportsman is always prepared, so keep an extra pair in your tackle box.


  • Comfortable medium fit.
  • Integral hinge.
  • Heavy-duty TR 90 nylon frame.
  • Includes hard case.
  • 100% UV light blockage for max protection.
  • 100% polarization kills reflected glare and reduces eye strain.
  • Built by hand and backed for life. Every pair of Costa Sunglasses includes a limited lifetime warranty.
  • Plastic lenses are lightweight, impact- and scratch-resistant.Glass lenses have the greatest clarity and are scratch resistant.
  • This style is prescription ready, click here to learn more about Costa prescriptions.


  • Base curve of 8.
  • DBL: 17.5mm
  • Temple Length: 117.6m
  • Lens size A/B: 60.5mm/34.8mm

FATHOM is rated 4.9245283018867925 out of 5 by 53.
Rated 5 out of 5 by from Great shades It is still hard to justify paying so much money when there are thousands of cheap polarized lenses out there. This is my second pair, I sadly lost my first set after years of comfort and unrivaled clarity. I fish fresh water, mostly for trout and the occasional salt water outing, and choose the COPPER GLASS cause it covers a wider range of light conditions, (not so great at dawn or dusk) but anything in between is great. I also kayak and raft whitewater where the going is tuff for any piece of gear and lenses are particularly vulnerable. They are confortable, lighter I feel, the frames are though to break, and the hinges put up with a lot of unintended abuse. The glass lenses last me a long time with minimal care compare to my previous buys that were relatively fragile and needed constant repair or replacement that wiped out the "great deal" to begging with. I play an work in a dusty (camps/roads) or wet environment were my lenses are subject to grit and bumps all day long, the last thing I need is to worry about them, all I want to do is put them on and go on with my day without haven't to worry about scratching and ruining my investment (river guide salary doesn't give much room for error). Often find myself not having handy the proper cloth to clean them, (but although not recommended) my t-shirt will do! I had to replace my lenses once provably because of this bad habit. You are obviously thinking about it, go ahead and do it, your eyes will thank you and eventually your wallet will to.
Date published: 2016-09-17
Rated 5 out of 5 by from Full time live aboard boater I live on my boat full time, 10 years so far. I expose them to constant salt air as we cruise in all types of weather. These glasses (Fathom, blue mirror glass lens) are on my head from sun up until after sun down, every single day. I do not squint with these and it makes seeing into the water much easier. No discomfort whatsoever. I would highly recommend these for anyone, especially anyone serious about boating, fishing or any outdoor activity. Never lost shape and never fallen off, no matter what I am doing. Buying another pair, just to have a backup. Thank you Costa, for saving my eyesight in extreme conditions. M/V Leap of Faith, Punta Gorda, FL
Date published: 2016-06-30
Rated 5 out of 5 by from Made for me! :) I have had my original pair (burnt orange frame w/ green lenses) going on 11 years and totally love them! I recently purchased a pair of all black (frames & lenses) for a different look and love them just as much! They fit like they were designed and made for me!
Date published: 2016-09-15
Rated 5 out of 5 by from Gift for my hubby! This was a just because gift to my hubby and he loved them. He mentioned he wanted these awhile back for when he goes fishing. Great quality
Date published: 2016-06-28
Rated 5 out of 5 by from Best glasses I ordered these glasses and they have been just as good since I got them.
Date published: 2016-07-05
Rated 5 out of 5 by from Love my fathoms Never had a pair of Costas and got a pair of blue 580 glass lens. They are the finest pair of sunglasses I've ever had. Great for inshore fishing, ballgames and everything at the beach. I bought my son a pair of grey 580 plastic lens. He plays baseball in the summer and in high school. He loves them as well.
Date published: 2016-08-22
Rated 5 out of 5 by from Best. Glasses. Ever. I have owned two pairs of these glasses and they have served me very well for many years! They are tough and durable which I require because they get used daily, year round and I'm often hard on them! These are the only glasses I wear!
Date published: 2016-05-25
Rated 5 out of 5 by from Best in the World I bought my Fathoms 15 years ago. A daily wear for bright conditions and fishing. The lenses allow your eyes to relax and the polarization lets your vision cut through water's glare when fishing. I have had my Fathoms for so long they are like a part of me. After 10 years of wearing, the rubber on the arms stated to peel, but because of the lifetime guarantee Costa replaced my frames. Five years on, my glasses are still the best ever. Thankyou Costa, you are simply the best in the world
Date published: 2016-05-11
  • 2016-10-27T08:01CST
  • bvseo_cps, prod_bvrr, vn_cps_3.4.0
  • cp_1, bvpage1
  • co_hasreviews, tv_9, tr_44
  • loc_en_US, sid_fathom, PRD, sort_relevancy
  • clientName_costadelmar
  • bvseo_sdk, p_sdk,
  • CLOUD, getContent, 70.62ms