Great Thatch island in the BVI’s is believed to be named for the infamous Pirate Blackbeard. Like it’s name sake, Calcutta’s Thatch Discover Sunglasses will be there with you on whatever journey your life takes you. Our C3 lens technology will give you better clarity and contrast at what you are seeing, and better color enhancement while blocking harmful UVA & UVB rays. The Thantch is available in three frame and lens color combinations.