The Vitapearl memory pillow uses visco elastic memory foam. The top carries a pattern of spikes. Those spikes let air move across the surface. So the pillow does not trap heat the way a flat block of foam can. The foam then adapts to your head form by taking the shape of the neck and shoulders.
It returns to its original shape within 60 seconds of compression. That springback is what keeps a pillow useful over years of use. Foam that recovers holds the neck at the same height.

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