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I'm actually using the 1/3 mattress double B type (strong support), but thanks to Oriviewer, I can now use the 1/3 single firm "entry C type" ๐ I'm using it right now in my son's room๐ It's not too sticky, and it supports my back firmly, so it's a type I recommend to people who are using memory foam mattresses for the first time๐๐ปโโ๏ธ I personally don't prefer the type that sinks in deeply, so I'm currently using the firm type, but it feels like it supports my back a little more! It was delivered in compressed packaging, so the mattress was in a small box. ๐ฆWhen you open it, the mattress inflates and the mattress is complete!! (Unboxing is so easy!) Today, my son is having fun on his new mattress.