"Cuin," or "cuin fill power," is a measurement used to quantify the loft or fluffiness of down insulation in outdoor gear. It specifically gauges the volume that a given weight of down occupies in cubic inches. A higher cuin indicates that the down has greater loft, which generally translates to better insulation properties. This measurement is commonly used in the outdoor industry to assess the quality and warmth-to-weight ratio of down-filled products, such as sleeping bags and jackets. Consumers often look for higher cuin values when choosing gear, as it signifies superior loft and thermal efficiency. Understanding cuin helps individuals make informed decisions about the performance characteristics of down insulation in their outdoor equipment.

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