The Heart Rate Belt Chest Strap is made of a comfortable and durable blend of nylon and spandex. It's compatible with Bluetooth, and can be used for walking, light jogging, or long distance running. The strap is stretchable up to 100cm and easy to adjust. It's also waterproof and washable, and supports heart rate tracking and history logging on mobile devices and apps. With attention to detail in design and materials, our chest strap is the superior choice for heart rate monitoring during outdoor sports. Features 1. Super comfortable and soft strap: Made of a blend of nylon and spandex, our strap is specially designed for more than 15 hours of comfort. 2. Reliability: walking, light jogging or long distance? Keep an eye on your heart rate and read your heart rate history on your mobile phone, app or watch. If you train regularly, we recommend you add an additional chest strap. 3. Comfortable: With great attention to detail, we have set ourselves the goal of exceeding your expectations every day with a hand-selected selection of high-quality materials and superior product features compared to competitors. 4. Technology: Our team supports you when connecting the strap as well as choosing the right app. Unisex universal size , stretchable to 100 cm. Easy to adjust and put on. 5. Waterproof, friction-free soft rubber: The quick-connect electrode is protected by a soft-touch, waterproof and sweat-proof rubber coating. Fully washable (not suitable for swimming). Specification Material: Nylon Color: Black, Red, Pink, Gray, Blue, Yellow, Orange, Dark blue Size: 1m Weight: 40 g Package Include: 1x Chest Strap