Pit Vipers belong to the sub-family Crotalinae of the family Viperidae (some source say that the pit vipers belong to a separate family, Crotalidae). Freedom is what allowed Buzz Aldrin to land on the moon. Introducing the Double Wides. Pit vipers have heat pits on the sides of their faces, located between their nostrils and eyes. Freedom is also what allowed Buzz Aldrin to pull back and sock that naysayer who called him a liar right in the eye in front of every camera possible. Regular price $69.69 Regular price $89.69 Regular price $59.69 Regular price $69.69 Regular price $79.69 Regular price $89.69 Regular price $79.69. These pits can sense the slightest temperature difference, which help the snakes to detect their preys. Regular or wide, I always choose wide. Cut and paste these to your face to find out if you're more of an Original or a Double Wide. The USA polarized Pit Viper sunglasses remind me of a word patented by America in 1776: Freedom. With 12mm more room for your big honkin' face.