The clasp will be more durable to hold your watch safely. Fit wrist 7.1-8.9inches (180-225mm) [Quality Silicone] This fenix watch band made of flexible silicone, comfortable for day-to-day wear. Slots in band to adjust length, you could choose a preferred slot to use, and adjust it to fit your wrist. The silicone band keepers will also help your watch band stay in place. [Easy Fit Mechanism] It’s easy to take on or remove the band with easy fit connection mechanism. The part that connect to your watch face fits well and it’s durable enough to hold your watch in safe. Good for sports activities or daily movement, super easy to switch bands.