RAC-A-TAC Rolling Knee Pads with 3" Casters and Chest Support This model would be your choice if you need to move rather quickly in a lateral position, use it mostly on rough surfaces, have large feet or long legs, or work mostly kneeling/sitting, such as auto body repair and PDR techs, painters, fabricators, etc. Features Chest support will allow you to work in a supported leaning-over position, while sitting and kneeling on the Racatac Speed and comfort for a demanding job Comfortable, web spring seat Adjusts from 11.5" to 15.5" high Made in the USA Thick foam inner knee pads for all-day comfort 3" polyurethane ball bearing casters Weighs 14 lbs, load capacity 300 lbs