Synthetic insulation is measured in grams, so a jacket with a 80g rating simply means that a 1 meter by 1 meter piece of that particular jacket's insulation weighs 80 grams. The higher the rating, the warmer the jacket.
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Water Resistant Fabric - A Durable Water Repellent (DWR) finish allows fabric to shed moisture and prevents saturation to keep you warmer. DWR also helps repel oils and stains which can affect the fabric's breathability. Clothing with a DWR finish is a must in snowy or wet conditions.
