3-Wheeled Walkers do not have seats like the 4-wheel Rollators. They are typically used by people with balance issues, but are fully capable of supporting users weighing up to 300-lbs. The 3-wheeled walker's advantage is greater maneuverability. With only a single front wheel, passing through doorways or a tight path is easy. All this and this type of walker provides so much more support than a cane.
For stability and safety reasons, 3-wheel walkers have a slightly wider footprint, usually around 25 inches overall.
These 3 wheel walkers collapse inward to fold. The rear wheels come together so when folded they are only about 10" wide. Easily fits into auto trunk or back seat.