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This is a novelty baseball cap printed with a spiral of pi digits and 3.14 Pi Day graphics. It is a costume-style gift item aimed at math teachers, students and pi enthusiasts rather than a performance cap. The build is a standard unstructured cotton-twill cap with a curved brim and an adjustable back strap, so it sits in the same class as other print-on-demand novelty caps. Expect the print and the joke to be the selling point, not ventilation, sweat management or long-term durability.
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Lowest price we've seen: $11.89 on Nov 11 at Amazon. Tracked across 1 store since Nov 11.
This baseball cap has a Pi Day math design. The artwork shows the digits of pi, 3.14, arranged in a spiral.