Electric Knoxville XL polarized sunglasses. Can you have too much of a good thing? We think not. That was the thinking that guided the design of the all-new Knoxville XL. With the rock-solid aesthetics of the original Knoxville intact, we've up scaled the sizing to create a frame that offers more coverage and a larger look while maintaining clean, classic lines and uncompromised fit. Lightweight six base mold injected grilamid frame. Six base polycarbonate lens. Three barrel stainless steel optical hinge. Electric logo at temples. 100% UV protection. 98% Blue light protection. Imported.