Cade 1.0 Prescription SunglassesULTRA LIGHTWEIGHT NYLON The Cades TR 90 nylon frames are significantly lighter than industry standard materials like acetate and polycarbonate without sacrificing strength or durability. Patented Fit and Retention System WONT SLIP OFF YOUR FACE. And forget about those painful pressure points on your nose. Inspired by the soft but amazingly sticky feet of the Gecko, our patented GEKO fit and retention system features a proprietary elastomer for nose