FIRM! holy heck, it's firm... but beautifully so. Like an Asian AirBnB firm. Like gym mat firm. My son put a bamboo mattress topper on it to provide a tiny bit of fluff before the firm, and that was the perfect combination. This mattress was so easy to get out of the bag that my 12 year old did it unsupervised, but then it did smell like paint for the next two days, so give it time to off-gas. A nice cost effective mattress if you are not a huge person or opposed to FIRM firm mattresses!