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Comfort is a rather subjective thing. Some sleepers want the whole bed to themselves moving around in their sleep while others are much like a ‘crouching dragon’. Comfort to some may also mean having a soft or a medium mattress.
There are many such factors to consider when looking at choosing a ‘comfortable’ mattress. Size is one of them. Mattress size is a personal preference. Understanding that preference with specific dimensions and own expectations is key.