© 2017 Kaunas University of Technology. All rights reserved.In order to evaluate the dynamic performance of car seats in rear impacts, the dynamic whiplash test is applied which currently utilizes the BioRIDII dummy representing a 50th-percentile male. Since occupants with diverse characteristics are subjected to rear impact loading, adaptive car-seats are required that respond optimally to different occupants and crash pulses. For this purpose, computational multi-body models of a generic car seat and three different male occupants are developed to study different car-seat designs. Using the 50th-percentile male occupant model, two different anti-whiplash car-seat models are developed which are shown to mitigate whiplash successfully for the given range of crash severity. These two car-seat models are then subjected to the same crash pulse set by using the lighter and heavier male occupant models. One of the car-seat models performs better since it structurally adapts itself to both the weight of the occupant and the crash severity.