Features: Replacement Chest Strap is suitable for various models, with adjustable sizing from 27.56-39.37inches for a secure fit during workouts. Craft from silicone, this breathable chest strap offers durability and enhancing electrode signal transmission for accurate heart rate tracking. Designed for athletes, fitness enthusiasts, and outdoor adventurers requiring stable heart rate monitoring across running, cycling, and high intensity training activity. Optimized for sweaty workouts and water resistant environment, its moisture activated electrodes maintain skin contact to deliver real time data consistency. The stretchable silicone fiber blend adapts to body movements while keeping sensors firmly positioned, ensuring performances for training or gym. Specifications: Component: Silicone Color: Black/Blue/Redness/Green/Orangeness/Gray/Purpleness Size: Approx. 27.56-39.37inch(70-100cm) Package Includes: 1PC Replaceable Soft Belt note: Please allow 1-2cm errors due to manual measurement. Due to the differences between different monitors, the picture may not reflect the actual color from the item.