The standard, non-wheeled walkers are light and durable, but you must pick it up to move. A Two-wheel walker, which has wheels on the two front legs, is helpful if you need some, but not constant, weight-bearing help. 3 Wheeled walkers / rollators provide balance support like a four-wheel walker, but it is lighter weight and more maneuverable. Four-wheel walkers are for people who don't need to lean on the walker for balance but still need that extra support. The higher end ones have four wheels, brakes, a seat and a compartment under the seat for storage. For more questions, please don’t hesitate to call 1-877-234-2018.