The Ferrata starts as a standard-size frame and becomes a glacier goggle when you need it. Magnetic centerpieces and side shields both perforated for airflow click on to block peripheral and frontal light without suffocating your face. When conditions don't demand the extra coverage, they remove cleanly. Made from Rilsan G850 a bio-based polyamide used in high-performance outdoor applications with electroplated stainless steel hardware and Helio polarized polycarbonate lenses for UV400 protection wherever you go..View Ferrata Sunglasses by Sunski on our site for more info. - The Bespoke Post store has the greatest gear from the world's best small brands. Free exchanges, easy returns and no commitments.