smartLAB Replacement strap 64 cm S-XS hrm W heart rate monitor, but also for other products such as Polar, Garmin, Kettler and others with a buckle spacing of 45 mm : Amazon.de:
The Brilliant Garmin Fenix 6 Pro Feature No-One Is Talking About
Hands-on with the new Garmin FR735XT Triathlon Watch | DC Rainmaker