What type of material is used on the ZeRound band? May 21, 2016 08:33 Updated The band of ZeRound is based on a thermoplastic polyurethane TPU Related articles Is it possible to change the ZeRound band? What is the Bluetooth operating range? Can I wear ZeRound while swimming or showering? ZeRound My ZeRound is not charging, what should I do?