Costa 580P vs 580G: Is Glass Worth the Extra Money?
Costa 580P is polycarbonate and 580G is glass. What 580 means, how they differ on weight, clarity and scratches, what each costs, and which one to buy.
The Wave — polycarbonate
Glass vs Polycarbonate Fishing Sunglasses: Which Should You Buy?
Glass vs polycarbonate fishing sunglasses — the real difference, when each wins, and whether the glass upgrade is worth $60 more.