We selected the soft version of this matress. When they arrived (we ordered 2 twin xl mattresses for our adjustable beds), we opened them and let them decompress for 48 hours. They came up to the correct height and shape. I am a side and stomach sleeper and need the head slightly elevated. No problem there, but these "soft" matress are extremely hard. I had hoped they would soften up, but we are at 5 weeks and they are still very firm. They may have softened up a bit, but not much.
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