Only one side is working. We had done a lot of walking in the heat but as there was no way of loosening off the lower strap to allow overheated feet to breathe they were returned to my suitcase for the remainder of my holiday. but are awesome as audio loupes. I only use it about two times a day talking to my wife for a minute or two so I havent had a lot of experience using it, but I will say that the talk button doesnt always seem to work. I have had these shoes for a month or two now and i wear them everyday all around the house. I wish FitFlop would offer them in a narrow width. My teenage son loves these flip flops. Moreover, the arch had a bit of flex/give to it that was noticeable with every step. I wear them in the day and when I take my dog to play. Will be getting myself a pair soon.