The District Vision Perforated Strap Hat runs light enough for hard efforts without losing structure. Perforated side panels move air through the crown, while an internal browband adds shape to the fit and pulls moisture away from the foreheadWhat Our Gearhead(R) Experts Are Saying:"I clip the chin strap down before a windy ridge run and forget the hat is even up there, no grabbing at the brim mid-stride. The shock-cord clasp adjusts with one hand while I'm still moving, no stopping to fuss with it."