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Pi Black Cap For the math nerd who loves pi. $16.95 Qty:    AVAILABILITY: Product Number: 10636767 Product Information Top it off in our structured black cap made of sturdy, durable brushed canvas. 100% cotton breathes for year-round comfort. Adjustable closure with a low profile crown. Images are permanently adhered with a sturdy patch. Look cool on bad hair days or when shading your eyes from the sun. One size fits most. Adjusts from 20" to 24" Crown measures 3 ¼" Structured 100% brushed cotton canvas Permanently adhered polyester patch