Review on RuenTech Replacement Fastener Ring for Garmin Vivosmart HR / HR+ Bands - Pack of 11 - Silicone Connector Security Loop - Compatible with Garmin Vivosmart/Vivosport/Vivoactive 4S/Vivomove 3S/Venu 2s - Color: Black by Leon Thompkins

I have a vivosmart hr+ (s/n 4JF315489) and this replacement strap fits perfectly. It's not as hard/thick as the original so may not last as long as Garmin's original (which I believe lasted 3 years) but it's a set of 11 for under $9 Dollars so it's worth it as they will last together for many years. Being a bit more pliable and flexible, they're also very easy to "adjust" (simply slide them onto the strap via the metal clasp). The protrusion in the hinge is key to holding the hinge in place. Works perfectly! I didn't experience any side effects like the other reviewer and I have fairly sensitive skin (the other reviewer may have received a contaminated batch); but I suggest you can gently wash them with mild dish soap before use if you are concerned.