Why Your Sweater Isn’t Warm (But You Are)

Why Your Sweater Isn’t Warm (But You Are)

We’ve all said it at some point: “Put this on, it’s a really warm sweater.” But is that actually true? Can clothing really be warm on its own?

The honest answer is: no. Clothing itself isn’t warm. Even the thickest wool sweater doesn’t give off any heat. Try leaving that "warm" sweater out on a cold balcony for an hour — when you touch it, it’ll feel cold.

What clothing does do is keep you warm. You are the source of heat. Your body constantly produces warmth, and the job of your clothing is to trap and preserve that heat. The better the insulation, the warmer you stay.

The secret to good insulation? Air. Air is a natural insulator. Clothing that traps air well — in the fibers and in the structure of the fabric — offers the best protection from the cold. Materials with a slightly rough or uneven texture can create small air pockets that hold onto your body’s heat, keeping you warm and comfortable even in chilly weather.

So the next time you put on a "warm" sweater, remember: it’s not the sweater that’s warm. You are. The sweater just keeps your warmth from escaping.