It's a Vibe Trucker Cap

It's a Vibe, this hat speaks for itself

60% cotton, 40% polyester
Structured, six-panel cap
3.5″ crown (8.9 cm)
Hard buckram front panels
Mesh back
Permacurv® visor, matching undervisor
Plastic adjustable closure
Head circumference: 21⅝″–23⅝″ (54.9 cm–60 cm)

Size guide