Not actually 12”, barely 11”... love the mattress but not truly 12”... based on other reviews seems like this is a common complaint.. did i mention that i sent it back and was sent a replacement the same width...11”!! honestly i love the mattress but wish they would have advertised it at true dementions.

We have had this mattress (12" Serta Sleep-to-go) for about 2 weeks. We bought it to replace a very old sagging pillow top spring mattress in our master bedroom. We were not a fan of the pillow top and have liked firmer beds in the past, so the negative reviews did not scare us. I should note that we have a sleep number in our other bedroom and are happy with it, but it's not great for non-sleeping activities, so we were hoping for an alternative. Shipping wise, the bed came on a Monday instead of the previous Friday that was estimated via email, but that didn't bother us. The box it came in was missing a wheel and part of the box was torn, but again that didn't bother us either. It was easy to unroll and unfold and it fluffed up to almost 12" almost immediately after unrolling it (12" on one side, 11 3/4" on the other an hour in). It had a not pleasant off-gassing smell, so we slept elsewhere the first night, turned on the exhaust fan in the connecting bathroom, and tried it the following night. My experience and my husband's experience on the bed were completely different. I am about 36 years old, 5' 8" tall, and 120 lbs and have slept well on any bed my whole life, cheap hotels included. Every night I slept on this bed I had extreme problems falling asleep (took more than 2 hours each night), woke up pretty close to every hour, and woke up sore through my shoulders, neck, and back in the mornings. I stuck it out for more than 10 days trying different pillows, positions (I sleep on my side, back, and occasionally my stomach), and switching sides of the bed with my husband. There was only very minimal improvement if any and I was still waking up frequently through the night and having numbness and soreness in my elbows and knees, which I've never experienced before. I stopped trying when I got a debilitating headache that lasted 8 hours and seemed to stem from the neck/shoulder/back pain and tightness (my first non-migraine headache in over 20 years). Needless to say, we will be returning the bed. My husband is also 36 years old, just over 6' tall, and weighs about 230 lbs. He generally sleeps on his side, and sometimes his stomach or back. He literally has had the best two weeks of sleep in his entire life on this bed. For the 17 years I have known him, he has always had problems sleeping - waking up in the middle of the night, getting up at 5:00 am because he can't get back to sleep, and basically living life in a state of semi-exhaustion. In contrast, on this bed, he has slept like a baby, almost overslept for work at 7:00 am, and says he feels rested and wonderful in the mornings. If we could cut the bed in half, we would. So if you are considering the bed...flip a coin?

Was cautious about buying online. I read the reviews and took a chance. I did have concerns about if i needed to return it which a customer service rep answered. It arrived on time and my only regret is not getting the kg size. Love it! Extremely pleased.

18 years ago we bought a similar mattress from Sam's Club and were extremely satisfied with. it. This one we have not liked as well. 1. It took longer to fluff out, so we had several nights of sleeping on "wierdness" while we waited on this to happen. However, it did fluff out as predicted. 2. It is extremely firm. Much more so than our last mattress. I liked it, but it hurt my wife's back. Se solved this by buying a mattress topper. I feel that it is a good quality mattress if you like firmness. Now that we have the topper, it is great.

We bought this bed about a month ago, we didn't want to spend 1500 dollars again on a mattress set,since you can't flip most mattresses any more! The more exspensive need was definitely more comfortable , but for a third of the price, this one will work, for now ! Getting it shipped in a box was definitely awesome though!

I bought this mattress for my guest room. It is firm, but it's a softer firm than a standard mattress. It is quite comfortable to sleep on. The mattress never expanded to 12 inches, but that has not impacted my review of this product. I would buy this mattress again!

It’s a good mattress. It is not as firm as I imagined it would be, but it’s far from terrible. I have chronic back issues and have found that firm mattresses are the most pain-relieving for me. This one does have some “give” but not too much. It’s not rock-solid like some other firm mattresses.

I purchased the firm mattress and I will have to say that it is way more firm than I thought it would be for foam, which works for me. I have had it a couple weeks and I have no complaints. It was easy to set up and puffed up almost immediately after removing the plastic. It gives support to my lower back and hips. I don’t wake up with pain to that area anymore

I bought this mattress about a month ago. Ordering, shipment, packaging was all as expected. There was no smell from mine as others referred to noticing. I had to do something to better my sleep as I woke up achy every morning. On the Serta, I wake up everyday now without hitting snooze, feel refreshed and no part of my body hurts at all. It's a magical combination of support & softness. The cooling effect isn't too much, even on colder nights. I could not be happier with this purchase! My only regret is not buying sooner!! I have recommended this to all my loved one's & already, my brother & his wife have purchased the same and can't wait for the delivery!

Sleeping much better! Have had a tempurpedic and it was too hard. went to regular firm mattress and slept better but still woke up every morning hurting (have back issues). I sleep much better and don't hurt every morning! (I'm a back and side sleeper.)