The Mono-Ski was designed for use by those with strong upper body strength and weak lower body strength. The piece of equipment consists of a molded plastic seat attached to a long ski on the bottom. You can control the ski by turning your body, or using ski poles. You can also use outriggers to give yourself more control over your run. Amputees, those with polio and other diseases can use this item.
A bi-ski is similar to a mono-ski, except that it has two skis underneath the plastic seat, which gives you more stability. These work with outriggers so that you can control the speed and stability of the equipment and it was designed for those who can't use their legs. If you need more help, you can also use the bi-ski with a tethered attachment that lets another person push or pull you down the mountain.
The tandemski is the most elaborate piece of adaptive ski equipment and was designed for those with limited mobility. Skis placed on the bottom of the comfortable seat gives a smooth ride, while you also have access to a safety break system. If the passenger falls from the piece, it immediately stops. It also has room on the back for another person to control the piece if you don't have the ability to do it yourself.
Sliders are the most common type of adaptive ski equipment. This looks similar to a snowboard, but it has a tether attached to the side. You can sit or stand on the slider and have another person pull you down the mountain. There are also sliders with a standing bar on top, which gives you the chance to hold onto the slider as you move along the snow.