Simple shades won't cut it on the slopes. Instead of donning full-on goggles, Sunski's Ferrata sunglasses offer a convertible, more conventional option. Its large square silhouette is enhanced with a removable perforated center piece and side shields that help block glare on bright days while allowing air to flow through. The frames combine thermoplastic and stainless steel for durability, and the Helio polycarbonate lenses provide sharp optics.