The Down Around Hyperclean pillow-in-a pillow design features a feather filled inner pillow for resilient support surrounded by an outer pillow of fluffy down for softness and comfort. Utlizing a special washing process called Hyperclean the down and feathers have been washed and rinsed up to eight times insuring the removal of allergns, dust and dirt. 100% cotton cover, 230-thread count, five-year factory warranty. Use AllerTech Pillow Protectors to encase pillow for mite-free protection.