Silk pillowcases beat cotton for keeping moisture in, especially in heated rooms.

Silk pillowcases are better than cotton for reducing overnight moisture loss in heated rooms.

Here’s the deal: Cotton is thirsty. It wicks moisture away from your skin and hair like a paper towel. In a heated room (which already sucks humidity out of the air), cotton accelerates the drying effect. You wake up with tighter skin, more frizz, and sometimes even static.

Silk is far less absorbent. It doesn’t pull moisture from your skin. Your natural oils and any skincare you put on before bed stay where they belong. Bonus: the smooth surface means less friction, fewer sleep creases, and less hair breakage. That’s not the main question, but it’s a nice side effect.

The catch? Silk costs more and you have to wash it gently. But for the specific goal of keeping moisture in your skin overnight in a dry room, it’s not close—silk wins.

Your skin will thank you come morning.