Silk can absorb moisture, but it often feels less “wet” on the skin and can stay comfortable compared with some synthetic fabrics, especially with a silk pillowcase. It is not a performance sports fabric like technical polyester that actively wicks sweat away. Instead, silk is more about gentle moisture regulation and a comfortable temperature feel.

Many people find silk cool and pleasant when they sweat lightly. If you sweat heavily, any fabric can start to feel damp, and factors like ventilation, duvet choice, mattress, pillow, and room temperature become even more important. Compared with silk, polyester satin can feel stickier because it is less breathable.

For heavy sweaters, a breathable pillowcase (silk or percale cotton) and a cooler pillow often make the biggest difference.