See figure A/01
Passenger
Vehicles
Cars and personal vehicles are where most people meet a seat belt, several times a day, for years. That familiarity sets the standard: the belt has to pull out smoothly, latch first time, sit comfortably across the shoulder and retract without leaving slack.
Comfort here is not a luxury consideration — it is a safety one. A belt that is awkward, that rubs at the neck or that has to be fought out of its retractor is a belt people are tempted to wear badly or not at all. Geometry, webbing quality and smooth feed matter as much as strength.
What matters when selecting: the seating position, the height and location of the upper anchorage, the belt length needed to reach comfortably, and how the assembly is mounted in the vehicle.