"Firm To choose the firmness of a mattress, we recommend you, first of all, to try your bedding in a store. Try it in the same posture that you sleep in to feel comfortable. Please note that support for the body is an important criterion for sleeping well when you are looking for information on the firmness of a mattress. Individual comfort depends on the morphology of the sleeper. Indeed, the biger the body, the more important it is for the mattress to be firm. The firm mattress is suitable for morphologies from 1. 60 m/from 80 kg and up to 1. 80 m/from 90 kg. It is also perfectly suitable for those who sleep on their stomachs or on the side. "