Baseball Caps by Flexfit. Details:Enjoy breathable comfort with a Flexfit Mesh Trucker Hat. These blank 6-panel hats for men offer all-day comfort with their mid-profile, mesh side and back panels, and stretchable Flexfit technology to fit a range of sizes. Not only are these fitted caps stylish, but they also feature sun protection with a curved visor and a silver undervisor for enhanced shade and style.