The objective of this study was to develop and demonstrate a prototype 4‐point seatbelt system that has the potential to help reduce injuries for front right passengers in left (far‐side) oblique frontal crashes. Three series of oblique frontal sled tests and computational simulations were conducted with the 50th percentile male THOR. The baseline sled test with a 3‐point belt showed the potential for THOR to engage the airbag at an angle and roll out of the seat belt system, which resulted in increased lateral head rotation and potential head‐ to‐instrument‐panel contact. The observed chest deflection was also elevated in the baseline test. A prototype suspender 4‐point belt was then used in three sled tests and MADYMO parametric studies. Results suggested that uneven load limits at two shoulders are significant to help control the occupant kinematics. A higher load limit at the striking side of the shoulder allowed for THOR’s torso to rotate laterally towards the impact, which may reduce the lateral head rotation, and consequently reduce the BrIC value from the baseline test. The prototype suspender 4‐point belt also helped reduce the chest deflections due to belt loadings mainly transferred through the clavicles, not the ribs. A final sled test with the model‐predicted improved prototype restraint design showed reduced BrIC value (1.55 to 0.53) and reduced maximal chest deflection (50 to 38 mm) from the baseline test. These results demonstrated that the prototype suspender 4‐point belt has the potential to improve the occupant protection in oblique frontal crashes.