Optical quality sunglasses.
Tres Noir has taken the same quality you find in an optical glass and adapted it to sunglasses. Eyeglasses are made to be worn everyday and withstand the daily wear and tear while still looking great. Your sunglass quality should be no different. Which is why Tres Noir uses the same materials as most eyewear glasses - handmade acetate, monel, and European CR39 lenses.