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A full size Serta mattress measures 54" by 74", making it a great choice for growing children or for adults who sleep alone. Fortunately, there are many good choices for a Serta full size mattress, including spring, memory foam, and hybrid options. You can rest easy on your full Serta bed, knowing Serta is the top mattress manufacturer in the United States. Try an award-winning iComfort or Perfect Sleeper Serta full mattress, and you're sure to understand why.