Retrosuperfuture Bones Zircon U4Z is a unique hybrid between an oversized and enveloping sporty shield, a unique high-fashion frame, and a raver's dream. The thick yet functionally lightweight structure of Bones is made of TR90 material, a thermoplastic commonly used in high-performance technical glasses for its ultra-resistant and ultra-light properties. Bones is a sunglass with many strong features, from TR90 as the material choice, to the oversized enveloping design with its cool sinuous details to the lens selection. The lens is always the protagonist in the RSF game, balancing aesthetics and functionality. Bones features a special extra-large Carl Zeiss shield wrapping around the 'toric' shield in a selection of stunning finishes.