The Natural Pocket features natural silk and cashmere wool fillings for luxurious comfort. This mattress is hypoallergenic and dust mite resistant for a healthier sleep. The advanced zoned Mirapocket® spring system offers the ultimate in comfort. Each mattress with Mirapocket® technology contains individual springs that are held under tension in their own fabric pockets. Each spring responds to your body, spreading your weight evenly accross the bed providing zoned support where you need it most and luxurious, tailored comfort that is second to none.