The Rest Evercool King Arctic White Pillowcase keeps your Eastern King pillow cool and fresh with breathable, moisture-wicking fabric that helps reduce heat and sweat through the night. A technical blend of 80% nylon, 13% spandex and 7% ionic silver nylon offers stretch, a smooth hand and antimicrobial protection to limit microbes and odors. It's easy to care for and sized to fit securely while complementing neutral, minimal bedding.