Worlds Greatest Physics Teach Trucker Hat My Dad is the Worlds Greatest Physics Teacher t-shirts, stickers and clothing for dads and fathers. Product InformationUp for the long haul, our standard Trucker Hat features a resilient polyester foam front, and adjustable headband for the perfect fit. - Adjusts from 17" to 24"
- Crown measures 4"
- 100% polyester foam front, 100% nylon mesh weave back
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