"Sports bolstered" for MB seats should be interpreted "harder than natural diamonds". What they are saying is that instead of a cumfy-cushy seat, it is firmer and more supportive during higher speed cornering, etc.
Is is that. It also feels a little like you've spent an hour on a picnic bench when you get out of the car. Personally, I'd rather have softer seats but that's just my preference. What else would we do if not complain?? :lol: