The temperature-sensitive memory foam was initially referred to as "slow spring back foam"; Yost called it "temper foam".Created by feeding gas into a polymer matrix, the foam has an open-cell solid structure that matches pressure against it, yet slowly springs back to its original shape

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A memory foam mattress is usually denser than other foam mattresses, making it both more supportive and heavier. 

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you can find more about vesgantti foam mattress 

indulgent comfort with extra pressure relief