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Enjoy a great night's sleep when you lay on this Serta(R) Perfect Sleeper(R) Cobalt Calm plush 13.. For more information, go to Shipping. Serta(R) Perfect Sleeper(R) Cobalt Calm Plush Mattress The mattress has 3 layers of Serta support foam, cool twist gel memory foam, quilt loft memory foam, and is 3 zoned foam encased with 850 coils.