Dedicated shoes, shoe covers, or sticky mats used in lab. Some labs have "sticky mats" at the lab entrance to "clean" the bottoms of shoes and prevent potential cross contamination between the lab and the external environment. The use of dedicated shoes or shoe covers would accomplish this more effectively. Such a procedure is required for pathogen labs. It requires a small area for changing shoes, or putting on shoe covers, outside the lab entrance. This can be best accommodated by having a "double-door" lab entrance.