Almost everyone has somewhere in their closet a piece of synthetic insulated gear, but what is the difference between the Thinsulate in your gloves, the Primaloft in your jacket, and the Polarguard in the sleeping bag you want to buy? The array of synthetic insulation choices out there can be a bit dizzying at times, so we are here to provide a breakdown of the most common types and their primary uses.
Generally, it is worth keeping in mind that warmth is really a function of trapped air space. So, while some materials insulate more efficiently than others, it is really loft that makes the big difference in how warm a garment or sleeping bag is. Many articles provide a good gauge of the thickness of their insulation by putting a gram-weight number right on the tag, like “15D 33g PrimaLoft ThermoBall” in The North Face Thermoball Jackets. That number refers to the weight in grams of one square meter of the insulation. So, thicker, warmer insulation will weigh more per square meter and hence have a higher number. As a guide, 60 g is on the thinner, lighter end of the insulation scale. 100g is standard for mid-weight insulated jackets, and 150+g thicknesses can be found in really warm jackets.
In addition to trapping air, insulation works by reflecting the body’s radiated heat, preventing it from escaping into the environment. Reflective barriers (like silvery hanging liners inside some jackets) work way better than synthetic insulations for this type of heat loss, but every once in a while you will see this function brought up on a manufacturer’s hang tag.
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