The resulting fibers are crimped to create air-trapping loft and spun into a bolt of fabric.
Polyester insulation is made of terephthalic acid and ethylene glycol, two petroleum derivatives (though it’s becoming increasingly common to source these compounds from recycled water bottles).
Also, down is usually the most expensive insulator because it’s sourced from goose or duck, so be prepared to pay a premium if you’re committed to a down jacket. In the face of winter’s snow, sleet, and sometimes rain, look for a coat with a water-resistant or waterproof shell or one that uses hydrophobic down, which is created when filaments are treated with a durable water repellent (DWR) coating. But they collapse when wet, losing their ability to retain warm air. These clusters offer the most warmth for their weight of any insulator. Numerous filaments diverging from a central point create the spherical shape of-and pockets of air in-down clusters.
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“If you can create more spaces to trap that air, the material will have better insulation.” Here’s how each does it and how to determine which is right for you. “We know air is the best insulator on earth,” says Hsiou-Lien Chen, a textile researcher and associate professor at Oregon State University. Each has its own advantages, but the way they keep you warm is similar: Your body generates heat and warms the still air trapped between the fibers and filaments of the materials. Down, synthetic materials, and wool are the most common types of insulation used in winter coats.
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