How FitFlops Work
Benefits 
•TheFitFlopputsariseofhighdensitymaterialcontainingthemicrowobbleboardunderthearchofthefoot.Italsohasanextra-firmtoearea.
•Thisrequiresthefootandlegtoexertmoreeffortwhenwalking,sincethewobbleboardrequiresextraeffortatstabilityandthetoearearequiresmoreworkfromthetoesinpushingoffduringastride.
Expert Insight 
•AccordingtoLagunaBeachfitnessexpertandtrainerJayBlahnik,FitFlopsprovidebenefits-- inthewayofstrongerfeet.Theydonottrimthighsorgluts.
Warning 
•FitFlopscanactuallycauseproblemsforthosewithflatfeet,accordingtoCaryGolub, podiatrist.Theypushthearchup,causingpainforthosepeople.Regularflipflopsalterthewayawearerwalks,causingpainandpossiblelongtermproblems.TheFitFlopmaybeabetterchoicethanregularflipflopsforlongtermwalking,butaregularshoeorsandalwithastrapandgoodarchsupportmaybeevenbetter.
Source: http://www.ehow.com/facts_7514456_fitflops-work.html 
Images: 
http://www.yodgee.com.au/