NWT Outdoor Research® Trad Dad Hat Trad Dad Hat is with you all day, from a morning hike, to an afternoon summit, and an evening backyard barbeque. A rugged everyday cap that only gets more comfortable with age. Low profile and curved brim classic dad hat. One size fits all adjustable buckle strap. Outdoor Research® OR logo. 100% cotton. Product measurements were taken using size One Size (7 1/8-7 5/8). Please note that measurements may vary by size. Measurements: Circumference: 24 in Brim: 2 3⁄4 in