Minimal reflectivity means the pants have just a small reflective logo or subtle accent—enough to catch a driver's eye from a short distance, but not enough to rely on in truly low-light conditions. It's the standard on most road cycling shorts because it keeps a clean, streamlined look without adding noticeable panels or material.
This level is perfectly fine if you mostly ride during daylight hours or finish your rides well before dusk. Think weekend road rides, group rides, or training sessions where you're confident about your timing.
However, if your commute regularly extends into twilight or you find yourself finishing rides after dark, minimal reflectivity isn't sufficient on its own. You'd want to add dedicated lights and a high-vis vest or jacket. The small logo helps, but it won't make you visible enough from a distance when drivers need time to react.