What is the material used for manufacturing ZeFit³ HR strap ? October 21, 2016 08:24 Updated The ZeFit³ HR strap is made from silicones and thermoplastic polyurethanes. Related articles Can I wear ZeFit³ HR while swimming / showering ? Can I change the strap of my ZeFit³ HR ? My ZeFit3 HR is stuck on the upgrading icon, what can i do ? What is the Bluetooth operating range of ZeCircle2 ? How to reset manually my ZeFit³ HR ?