We needed a twin mattress for our toddler with his new "big boy bed." Didn't want to spend a ton of money (as he is potty training and we expect accidents) but didn't want something too cheap. When the box arrived, my husband automatically assumed this was cheap/thin and not what he wanted (since they vacuum pack the mattress it  looks like it would not be supportive in order to fit in such a size box). We trusted other reviews that said it really springs to life and holds up - once we gave it a try, we have been very pleased with the support, quality and size/shape of the mattress.