The Costa Del Mar Triple Tail frame utilized the incredible performance of Titanium Fused Grilamid (TFG), the most advanced nylon made today.
Product Reviews This is my 2nd pair of Triple Tails by Costa del mar. I lost the 1st pair - bummer - otherwise, I would not have ordered another pair. My 1st pair were 2 years old, had a little wear on them, and were black with blue lenses. I decided to go with the tortoiseshell frame and green lenses this time, as I do a lot of nearshore, shallow water fishing in FL. These are excellent sunglasses - block the sun well, great polarizing qualities, as you can see through water with ease to help spot fish. The green lenses and type of glass I ordered block the yellow part of the spectrum. I would recommend these to anyone who is serious about having a great pair of sunglasses. P.S. I went to Colorado for 2 weeks and wore them hiking every day out there and they were great!
