Features: Waterproof and breathable, allows your skin to breathe freely, while providing the best for protection for sports sensor, make your sensor safer, beautiful and practical. Easy to stick, Just tear off the backing paper, you can stick it anywhere on your body, firm sticking, so you don'for t worry about falling off when you wear it in the shower. Made of high-quality elastic fabric material, close-fitting and comfortable, harmless to your body or skin, safe to use. You can use it with your sensor, and wearing the sensor for running, mountaineering and other activities. You will receive 30 pieces clear adhesive patches, enough to meet your needs for multiple quantities and different scenarios such as showering, swimming and sports. Specifications: Material: Elastic Fabric Color: Transparent Type: Oval/Round(optional) Round Diameter: Approx. 7 for cm/2.75 inch Oval Diameter: Approx.10.2 for cm/4.01 inch Note: The sensor is not included in the package. Please allow 1-2cm errors due to manual measurement,pls make sure that you do not mind before you order. Due to the difference between different monitors, the picture may not reflect the actual color of the item. Package includes: 30 Pieces Waterproof Sensor Patches