Looking at that little box upon arrival, you’d think “no way king size 10” mattress can fit in this”. You bring the box to where you want the mattress to lay / pop it open and you’re done! The mattress plumped up nicely and fit our bed frame just right. It’s not hard or too soft, but I prefer firm mattress. You still, however, have the softness from the top layer. The top of the mattress has a nice knitted fabric. Slept well without any aches. It takes about 2 full days for the mattress to open completely, lay flat and evenly before using it. Overall, I think this is a decent mattress for guest or second room. It is a mixture of the coil mattresses and the memory foam.