1. Comfortable and Breathable: The soft replacement strap is made of cashmere and zinc alloy material, fitting snugly around the wrist without leaving marks. Its excellent breathability ensures no sweat buildup even during prolonged use, making it suitable for sports and daily wear. 2. High Elasticity and Durability: The sports wristband features a woven cashmere structure with elasticity, adapting to various wrist sizes. It is resistant to wear and maintains its shape without breaking, ideal for intense workout environments. 3. Easy Cleaning and Quick Drying: This wristband can be easily cleaned with water and dries quickly, helping to maintain freshness and hygiene for frequent use. 4. Stable and Secure: Specifically designed for Whoop 4.0 wearable health fitness activity tracker straps, it offers a precise fit and helps prevent loosening during exercise. Color: Black Material: Cashmere + Zinc Alloy Package Contents: 2 x Fitness Band Note: Light reflection and different displays may cause slight variations in the color of the item shown in the picture compared to the actual product. Measurement may vary by up to +/- 1-3 cm.