It is about 2mm wider for Vivoactive 3. My wife has a Vivoactive 4 and her strap is about 1mm narrower so it doesn't fit either.
π HTC Vive Tracker (3.0) Triple Pack
3 Review
πΆοΈ Bose Frames Tempo - Polarized Sports Audio Sunglasses with Bluetooth Connectivity in Black
7 Review
πΉοΈ HTC Vive Tracker 3 Pack (2018) for Virtual Reality Headset
3 Review
πΆοΈ GELETE Bluetooth Sunglasses: Music, Calls & Polarized Lenses for Men & Women
3 Review