I have purchased many Olukai over the years and this is the first time I?ve been disappointed. ??*Update: I left these on the back steps (which face west) and in the heat of the summer sun . Unfortunately it?s going to be a return for me. I?ve done about 900 chin ups/pull ups on it, and it flexes, but it is sturdy and solid. It takes awhile but I do have to replace them from time to time. In the past I had an experience w a beautiful green Chaco sandal that turned my feet green w wearing. I use them in the gym and are so compact. I didnt see a registration code to get registered for 5 years of free spices so I sent an email to the manufacturer to get a code. IT HAD STATIC REALLY BAD IN THEM I WILL NOT BE BUYING SKULLCANDY ANY MORE Will update my review if it changes but as of 3 days it just started whistling.