No worries. This one is 3inches thick if I'm not mistaken. I purchased a single size (common with a twin standard mattress) in order to downsize myself, and from futonbedsfromjapan.com as I liked the reference info provided for a newbie like me and it being 100% cotton with no artificial mats / etc. The twin was just shy of $500 shipping included.
Generally speaking, what have your experiences been using them? ๐ค
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it should be fine.
they take some getting used to but as long as you're healthy it'll be OK.
did you get kakebuton too?