What is the material used for manufacturing ZeWatch4/4HR strap ? December 15, 2016 21:50 Updated The ZeWatch4/4HR strap is made from silicones and thermoplastic polyurethanes. Related articles Can I change the strap of my ZeFit³ HR ? Can I wear ZeWatch4/4HR while swimming or showering? How to clean the strap of my ZeWatch4/4HR ? Ajustement / Strap How to view and reply SMS on my ZeWatch4/4HR?