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Antonyms that are in the dictionary are marked in green. Antonyms that are not in the dictionary are marked in red.
It's a pillow-top mattress that's sturdy enough to comfortably support sleepers weighing up to 500 pounds.
Source: https://www.cnet.com/deals/get-a-new-mattress-and-sleep-soundly-with-up-to-600-off-at-saatva/