Although memory foam is generally considered safe, it may pose a problem for certain people, such as those who suffer from allergies, asthma, or other respiratory conditions. Memory foam may also bother you if you are very sensitive to smells.
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?? Duck Feather & Down: This is a natural filling that's often found in high-end hotel pillows. Duck feathers provide excellent support, thanks to their natural springiness. The down, or the fluffy layer found beneath the bird's feathers, adds an extra layer of softness and insulation.
Your head and neck should lie comfortably on the pillow to ensure that the spine is elongated. Like the back sleep position, your shoulders should fall just beneath the pillow and rest comfortably on the surface of the bed.