Rest Evercool Standard Midnight Blue Pillowcase uses a breathable, moisture-wicking fabric blend to help you sleep cooler and more comfortably. The 80% nylon and 13% spandex body with a 7% ionic-silver nylon treatment provides gentle stretch, quick-dry performance and helps reduce surface allergens. Sized for a standard pillow and machine washable, it's easy to care for and swap in for nightly use.