All done measuring your VO2 max Good, now slide your feather light Tifosi Podium Interchangeable Sunglasses on and head for the winner's circle. These performance shades were designed for people who live to perform and die by the details. The lenses swap out quickly, the optics are crystal clear right down to the decentered shape of the lenses, and the nose and stem pads grip your face even when wet. If you don't win, it won't be your sunglasses' fault. Proposition 65 Warning for California Consumers: This product contains chemicals known to the State of California to cause cancer andor birth defects or other reproductive harm.