Optimal Comfort and Performance: Experience comfort and functionality with our HydroKnit Wrist Band, designed for Whoop 4.0. This replacement strap features a U-shaped design for a secure fit while maintaining sensor functionality. Advanced Material: Made from high-quality HydroKnit fabric, the wrist band offers fast-drying and sweat-wicking properties, keeping you comfortable during workouts and daily activities. Easy Maintenance: The material is easy to clean and retains its shape and performance after repeated use, making it suitable for everyday wear. Note: Due to different production batches, slight variations in the physical product may occur, which do not affect performance. Color: Red Material: HydroKnit Package Contents: 1 x Waterproof and quick-drying Wrist Band The package includes only the items listed above; other products are not included. Note: Lighting and display differences may cause the color in the image to vary slightly from the actual item. Measurement error allowance is +/- 1-3 cm.