I weigh 120kg and had a super expensive Schlaraffia mattress I "reduzeirt" Promoted for 750EUR (normal price 1500 EUR) had bought the local mattress dealer 2 years ago after me this was recommended by the "shop assistant". After kitch time I got shoulder pain because I have overstretched as a side sleeper my shoulder joints. I had then brought out the Schlaraffia Matrazte out of bed and put on the floor and she was already "broken" - in the middle 5cm wider than in the original state. I then bought from Amazon this Frankenstolz mattress without advice from a shop assistant and after 2 weeks left my shoulder pain significantly.