MALOUF Z Shredded Latex Pillow with Rayon from Bamboo Cover - Resilient and Comfortable - Hypoallergenic - King Filled with shredded latex derived from sustainable rubber trees Shredded pillow filling is fluffable, but does not flatten over time Consistent filling does not shift or clump and has quick loft recovery Shredded latex provides excellent airflow and sleeps cool Incredibly soft rayon from bamboo cover; 3-year U.S. warranty