Arrived a few days early and was full size within a few hours of unwrapping. It's best to place in the bed before unwrapping. Keep the room well ventilated for at least 24 hours. Actual measurement is almost 14-inches, but will vary a little by mattress. I Put it in the guest room for my mother in law and she tried it the next night. By the second morning she was begging for info to buy the exact one (She bought 2). EVERYONE thinks memory foam is "to" firm when they first try it. Be patient. You'll probably come around. If not, buy a softer foam topper. Id say give it at least 3 weeks of mindfulness about how you feel in the morning Before buying the topper that truly isn't necessary for most.
**Always buy a "breathable" waterproof mattress pad. If it doesn't breathe you'll feel like you're sleeping on sand. Great Offer Stock has a large variety. They cost more than your average pad but this is where your extra $ will make a difference with sleep quality.
I've been buying memory foam mattresses from Great Offer Stock for 10 years now. We have 5 kids and now a guest room. So, I buy a LOT of mattresses! The price is incredible with shipping and I've never had a problem with any of them. I would recommend a thickness of at least 12 inches for adults. Our bed is 14 and perfect! My younger kids have 8 inch, which is fine for them, but I notice when I sit on it since I weigh more. I also recommend buying for thickness and not getting caught up in the "differences" like gel or cooling that hike up the price with little change in quality (I seriously can't tell a difference at all on my "cooling gel" compared to styles like this one). Instead be sure to use only 100% natural fiber sheets, blankets and pajamas if you tend to get hot at night. Linen is best, 100% cotton also does the trick.
Buy this mattress! You will not regret it!
Happy dreaming!