Buddhist Punk Collection Frame/Temple Colour: Navy Frame/Temple Material: Acetate Size: 70-20-110 Model No: 6BP2C4NAVY Hand Made Nylon Category 2 Medium Tint - Grey Graduated Lenses Nylon is a newer top-notch performance material, it combines the advantages of polycarbonate and CR-39 lenses. Nylon lenses have an outstanding shock resistance while being extremely lightweight, and do not crack when drilled (making them perfect for some frame shapes). This is an exclusive collaboration with Linda Farrow that produced the Sunglasses to their highest standards.