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.
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Unlike ordinary fleece, Karuishi Fleece uses a 2-layer knit structure with a brushed fleece interior for more loft and better insulating properties, while the exterior is tightly woven for higher abrasion resistance.