These are hands down the most comfortable thongs I have ever owned!!!! (and I own a lot) They never ride up or move out of position while I am in class or teaching. They lay flat so they are unseen under my pole shorts and the straps never roll on me which is nice.
downside: I wish they have more colors though or more in stock would be nice too... it always seems when I order that there is no selection or availability in my size. . .