Why Do Our Pockets Feel So Cold? The Physics of Radiative Cooling

Imagine your body is like a warm toaster. Even when you are sitting still, you give off warmth. This warmth travels through the air and also shoots out into space like an invisible beam.

The sky above us is incredibly cold, even on sunny days. When you put your hand in your pocket, especially one with thin fabric, it acts like a window. Your body heat escapes directly to that cold sky instead of staying trapped by your clothes.

Your skin has sensors that measure how fast heat leaves your body. If heat leaves quickly, your brain thinks it is freezing! In your pocket, the thin fabric lets the heat escape rapidly toward the "freezer" sky. That is why your pockets feel colder than a thick sweater, even if they are touching the same air.

It feels like ice, but it is just your body saying goodbye to its warmth.