For runners, an Apple Watch band has one job: stay put. A heavy metal band or a slippery strap will move with every stride, throwing off your cadence and your heart rate data.
1. Sport Loop Active: The king of running bands. It uses a hook-and-loop (Velcro-style) fastener. This allows for "micro-adjustments." As you run, your wrist swells. A Sport Loop Active lets you loosen the band by a millimeter instantly and easily, keeping it comfortable without losing sensor contact. Its built-in pull tab on the loop helps easily and quickly access it when you need it (or not).
2. Sport Band Active: For those who sweat heavily, nylon can get soggy. Sport Band Active's perforations allow airflow and channels sweat away. Once your workout is over, it can be rinsed easily and safely ready for your next workout.
The Sizing Factor for HR Accuracy: This is critical for Zone 2 training. Optical heart rate sensors need to be flush against the skin. To ensure your Strava data is accurate, always buy the Apple Watch band size tailored to your exact Apple Watch model and your wrist size. A secure fit equals accurate data.
