The purpose of this study is to evaluate a first generation obese anthropometric test device (FGOA), comparing its kinematic and dynamic behavior with two obese post mortem human surrogates (PMHS) in matching frontal impact sled tests. The FGOA was built around an existing fiftieth percentile THOR male crash test dummy’s skeletal structure but with unique flesh and additional mass added to the upper and lower torso and upper legs. It had a mass of approximately 124 kg, stature of 175 cm, and body mass index of 40 kg/m². Two 48 km/h PMHS tests and two 48 km/h dummy tests were performed with a sled buck representing the rear seat occupant component of a 2004 mid-sized sedan. Head, shoulder, pelvis, and knee maximum forward motion of the dummy were within 15%, 9%, 15%, and 30%, respectively, of the mean PMHS values. The mean peak of upper shoulder belt, lower shoulder belt, and lap belt tension were 5.9 kN, 6.8 kN, and 10.7 kN with the FGOA, compared to 6.4 kN, 6.6 kN, and 9.0 kN with the PMHS. This study was the first to evaluate biofidelity of the FGOA. The FGOA and PMHS exhibited similar kinematic characteristics that have been highlighted previously as potentially challenging for restraint systems design. Most notably, both the PMHS and dummy exhibited substantial forward motion of lower body and subsequent backwards rotation of the torso, affected by limited engagement of the lap belt with the pelvis. Although the differences presented suggest that further refinement may be warranted, the similarities suggest that this dummy may prove useful as a research tool to begin investigating the challenges of, and potential strategies for, the safe restraint of obese occupants.