Yep, they all have EPS. The more expensive models may come with 'gracopedic' foam under the bum for extra comfort or a boot for the top of the seat... but even those sometimes are on great sales! I had a plain jane black and red model with no extras, and it was my dd's most 'sleepable' seat we owned...she would just sleep through anything in there (she never slept as much in any other seat...go figure). The more padding the seat has, the quicker it can get outgrown (it raises the bum, which raises the head and shoulders, and pushes the baby up to the top of the seat sooner... once the head is about an inch from the top it's outgrown, so if you add an inch of padding in the bottom it can reduce the seat's useful life by some months).