Why does my hat turn white when I sweat?

Why does my hat turn white when I sweat? The white stains are due to a build-up of sweat and oil and can cause the color to fade permanently. Depending on how often you wear your cap and how sweaty you get, wash your cap once a week to avoid heavy staining.

The white stains are due to a build-up of sweat and oil and can cause the color to fade permanently. Depending on how often you wear your cap and how sweaty you get, wash your cap once a week to avoid heavy staining.