Pacific Headwear's Aggressive Heather Trucker Mesh Baseball Cap. Pro-Model and mid-profile crown shape. "Aggressive" heather front panels. Spandex Trucker mesh back. Structured Pro crown. Pro stitched finish. Universal fit. U-Shape visor technology. Contrast transitional undervisor. They are also very diverse caps and provide a great way to represent your team, company, or special event. Size: XS (6 3/8-6 7/8), SM-MED (6 7/8-7 3/8), L-XL (7 3/8-8).