It’s hard to say which is better overall, natural insulations or synthetic insulations, but there are some specific scenarios in which one definitely stands out over the other. For example, Johnson notes that coats made with down feathers are much lighter in weight than synthetics, and the weight-to-warmth ratio of down is remarkably high (meaning it’s shockingly lightweight considering how much warmth it provides). Down is also easier to pack if you’re headed on a trip or want to stow your winter gear for the summer. “It readily compresses and re-expands to full fluff more quickly and more readily over time than synthetic insulation,” explains Johnson. “Down jackets are therefore easier to move about in and easier to pack than other garments of similar warmth. Properly cared for, they stay closer to their original warmth level than a synthetic jacket over the same number of years of existence and days of use.” Wool is also a great natural fiber for winter because “it continues to insulate even when damp or soaking wet,” meaning you won’t suddenly start shivering if your wool sweater gets wet.
That said, there are some notable downsides to natural insulation, most notably cost—natural materials tend to be much more expensive than synthetics. “However, if a garment works better and lasts longer, it is worth the investment,” suggest Johnson, “and might pay for itself several times over in the long haul if you do not need to own as many different clothing items or do not need to replace them as often.” There’s also a higher chance that clothing made with natural fibers will require special cleaning instructions.
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