Details & Technologies Part of the Revo x Bear Grylls capsule collection, Espen is virtually indestructible. With Revo's advanced lightweight, impact-resistant Serilium polycarbonate lens and a bendable frame constructed of Revo SuperFlex™ material, Espen delivers next-level performance and durability for the most adventurous lifestyles. Elastomeric nose pads and temple tips will keep your Espens comfortably in place all day. DETAILS Revo high-contrast polarized Serilium+ lenses Lightweight, imp