Frame Colour: Yellow Temple Colour: Yellow/Silver Frame Material: Acetate Temple Material: Stainless Steel with Acetate Earpieces 49-22-140 Model No: PG15C4SUN Made in Japan Nylon Category 2 Medium Tint Lenses - Grey Gradient  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.