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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.
Made with high tenacity air jet textured nylon 6,6 filament yarns, KUIU packs feature the heavy-duty 500D or the ultralight 330D Cordura fabrics.