For Fitbit Inspire / 2 / HR / Ace 2 Strap Replacement HR Waterproof Soft RED
Adjustable Sizes: Fitbit inspire hr strap small size fits 5.5"-7.1" wrists. Fitbit Inspire hr strap large size fits 7.1"-8.7" wrists. With fine-crafted stainless steel buckle, you can adjust the strap to fit your wrist easily.