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 4.906976744186046 out of 5 by 43.
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 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
Rated 5 out of 5 by from Awesome glasses my 1st pair was stolen, and i bought another I love them so much. Great for fishing
Date published: 2016-01-29
Rated 5 out of 5 by from The fish get all the good stuff! Had Fathom's for many years. Swore I would never wear them on PWC's. Too lazy to walk up to house and get cheap sun glasses one day last summer on Lake Hartwell. Illustrated the Lipton Tea plunge to my wife off the back of the ski. Forgot Costa's were on my head. What a sick feeling when I surfaced and wife asked where my sunglasses were. Say it with me, "The fish get all the good stuff!".
Date published: 2016-01-08
  • 2016-08-24T08:03CST
  • bvseo_cps, prod_bvrr, vn_cps_3.3.0
  • cp_1, bvpage1
  • co_hasreviews, tv_7, tr_36
  • loc_en_US, sid_fathom, PRD, sort_relevancy
  • clientName_costadelmar
  • bvseo_sdk, p_sdk,
  • CLOUD, getContent, 15.29ms