Excellent Compatibility and Easy Installation: This wristband is designed for Whoop 4.0 and 3.0 heart rate monitors, providing a perfect fit and easy installation Allowing you to easily switch styles and colors to suit your preferences and activities. Breathable and anti-odor material for long-term wear: This wristband is made of breathable and anti-odor material It ensures comfort and freshness during extended use, making it ideal for active lifestyles and continuous wear. ADJUSTABLE ELASTIC FOR SECURE FIT: This replacement band features adjustable elastic to provide a comfortable and secure fit for any wrist size<br><br>Whether you're dressing casually for a day out or getting ready for a workout, this band is the perfect accessory to match your style and mood. Colour:Blue & White Material:nylon<br><br>Package Contents: 1 x Blue Knitted belt 1 x White Knitted belt<br><br>Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.