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Updated
Once unboxed, Leesa mattresses will begin to expand within an hour or so and reach their full size usually within 24 hours. Give it a couple of days to fully off-gas as well.
Placing the mattress in a cool room can help the mattress expand and off-gas quicker.
Derek Hales is the Founder and Editor-in-Chief of NapLab. His insights and work has been featured on ABC's Tamron Hall Show, Freakonomics, CBS News, ESPN, Reader's Digest, Homes & Gardens, New York Post, CNET, & More. Derek has personally tested 440+ mattresses and began testing mattresses in 2014.
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