When in doubt, order your typical size. If your measurements are in between those listed in the size chart, pick the larger size.
Wrap measuring tape across the forehead, just above the ears, and around the back of the head or where you normally wear your hat.
KUIU’s Durable Water Repellent (K-DWR) treatments bead and resist water, keeping it from penetrating the outer layer. This increased breathability and performance allow waterproof membranes to evaporate your sweat while blocking out moisture.