Port Authority Flexfit Mesh Back Cap. C812 Cotton & Polyester & Spandex An ultra-breathable cap with the patented Flexfit stretch for a comfortable fit. A silver contrast underbill adds character to this trucker-style cap. Fabric: 60/40 cotton/poly front panels, 95/5 poly/spandex mesh mid and back panels Structure: Structured Profile: Mid Closure: Stretch fit