This vented memory foam spring pillow works in a similar way to a sprung mattress for comfort and support. It has a double-wave design and internal system of active foam springs that compress and depress independently, providing continual support as you move around during the night. The central springs have a lower density to cradle your head, while the outer springs are firmer to give vertical support to your neck and shoulders. All the springs are removable, so you can even reposition them if you want. The pillow is made from top-quality memory foam, so it always returns to its original shape rather than gradually flattening out like ordinary pillows do. Both the pillow shell and internal springs are also vented, allowing air to circulate freely for a cooler, more refreshing sleep all year round.