This refers to the Shark vacuum cleaner’s ability to transition from hardwood floors to pile carpeting without the user pressing any buttons or turning any dials. Vacuum cleaners with Shark DuoClean technology have a bristle brushroll and a soft brushroll; the bristle roll is for carpeting, and the latter is for bare floors. With both types of technology on deck, the stick vacuum is ready to handle the flooring in your kitchen, bedroom, living room, and anywhere else you need a cleanup.