There are many different types and features of a walker. Type 1 walkers include both standard and two-wheel walkers. Standard walkers are the most basic and affordable type of walker and do not have any wheels. The user needs to pick up the walker and is often used by individuals with poor balance or stability. Standard walkers are also commonly used for people who tend to fall forward or travel short distances. Two-wheel walkers have wheels on the front legs and help provide some weight-bearing assistance. Two-wheel walkers may include a tray and are foldable for transport but do not include a seating option or braking system.
Type 2 walkers, ofter referred to as rollators, consist of four 6" wheels, a seating option and a brake system. Typically there are three different seat heights available, which are standard (24"), low (21") and super low (18"), depending on the height of the user. Loop-lock brakes, found under the rollator's handlebars, allow users to either squeeze the brakes to stop the rollator temporarily or push the loops downwards to lock it in place. Other features of Type 2 walkers include foldability for transport and baskets for storage. Type 3 walkers have many similarities to Type 2 walkers, such as seating options, braking system, baskets and foldability, but there are some notable differences. Typer 3 walkers are the most complex and expensive type of wheeled walker, have the largest wheel size (8"), and allow faster travel speeds. The brake cables are located internally within the walker's frame, which can make repairability more difficult. There are options available for slow down brakes, which enable a controlled walking speed by preventing the rollator from moving too fast. Type 3 rollators can be equipped with tall handles attached to the handlebars for taller users. A curb climber can also be attached, making it easier to lift the front of the walker over a curb or threshold.
Reference: Atlas of Orthoses and Assistive Devices [Electronic Resource] / | University of Toronto Libraries. https://search.library.utoronto.ca/details?11650957. Accessed 11 Feb. 2021.