Rolling Knee Walker instead of crutches -- works like a scooter to get around. This one has larger ATV wheels in front to make it easier to navigate over ground, grass, rougher surfaces, etc. All terrain style. Accommodates people 4'8"-6'2", max. weight 250 lbs. Platform height at lowest setting is 11.75", highest setting is 19.5", cushion is 2" thick. REQUEST LEFT OR RIGHT - easy to change yourself.