Professional Clog Birkis Professional Clog Medical professionals, factory technicians, chefs, or others who spend a lot of time on foot in wet or messy environments will love this heavy duty clog! Super Birki Clog Birkis Super Birki Clog For those wet, dirty jobs, this style provides long-term comfort because the replaceable cork footbed will mold to your feet over time. This style is roomy, but can accommodate narrower feet by adding Birko-cell foam underneath.