Compatible Design: Specially crafted for Oura Ring Gen 4, Oura Ring Gen 3, and Samsung Galaxy Ring, this silicone cover ensures a seamless and protective fit. | Perfect Fit for All Sizes: The elastic properties of this cover make it suitable for various ring sizes. Select Small for sizes 6-10 and Medium for sizes 11-15 for an ideal fit. | Scratch Protection: The protector fully covers your smart ring to effectively prevent scratches and damage during workouts or daily wear. | Ultra-Thin Comfort: Made from premium elastic silicone, this cover is ultra-thin and non-bulky, maintaining the natural feel and comfort of your ring. | Dedicated Customer Service: We offer a return and exchange service. If you encounter any issues, feel free to contact us-we will response within 24 hours.