The Knockaround Fort Knocks model embodies the classic design, strength, and color that has become synonymous with Knockaround. Inspired by the United States Bullion Depository in Fort Knox, Kentucky, the injection-molded frames feature gold bar detailing, articulating spring hinges, and raised Knockaround logos. These high quality, form-fitting frames make for a comfortable and durable fit while providing crucial UV400 protection for your eyes. The polarized lenses considerably reduce glare from surfaces like water, the road, and car windows.