The Zen R3+8 is a strong and comfortable futon with a perfect climate effect.
It beds almost everyone comfortably, initially even soft, but rest assured, it becomes noticeably firmer. Freshen it with plenty of air, turn it regularly and roll it occasionally and this futon will last you 10-15 years.
This futon is sufficient for light to medium weight futon sleepers or stomach/back sleepers.
Heavier people, from around 75kg or mattress emigrants, combine Zen R3+8 with any other Shiatsu futon, depending on their needs, to create the super comfortable TWIN futon.