Fill weight

"Fill weight" refers to the quantity of insulation, typically down or synthetic fibers, used in a specific piece of outdoor gear, such as a sleeping bag or jacket. It is measured in grams or ounces and represents the actual amount of insulating material inside the product. Fill weight is a crucial factor influencing the warmth and thermal efficiency of the gear; a higher fill weight generally indicates more insulation, which contributes to better heat retention. However, the effectiveness of insulation also depends on its type and quality. Understanding fill weight helps consumers make informed decisions about the warmth and performance of outdoor gear based on their specific needs and the intended use of the product.