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Read All Reviews for Serta Perfect Sleeper Ultra Modern Firm Twin-size Mattress and Box Spring Set

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  • the firmest mattress I've found
    Verified Purchase

    very firm mattress, the firmest I've found on O.co, and I've bought several. I've had this for several months now and turn it regularly and it is still just as firm as when I first got it. I am a size 22 in women's clothes -- without having to give my weight -- and this mattress is holding up very well.

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    karenkaye July 21, 2012
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