The Therm-A-Sleep Snow Queen Size Memory Foam Clusters Pillow features a combination of cooling fabric and adaptive memory foam clusters. Nordic Chill fiber provides a cool-to-the-touch feel, while transporting heat away from the sleeper 10x more quickly than cotton. Cooling effect works even through thick pillowcases. Added Tencel fibers are smooth for sensitive skin, and hypoallergenic, moisture-wicking, and inhibit bacteria growth. Multiple levels of firmness are perfect for side, back and stomach sleepers.