Made of elastic silicone, two sizes fit most rings, please choose S for Ring Size 6/7, M for Ring Size 8/9, L for Ring Size 10/11, XL for Ring Size 12/13 The soft slim design ensures comfortable wearing and perfect fit, no worries about scratching or losing it while exercising The silicone ring cover is designed for Oura Ring, a nice protective accessory that provides secure protection for your ring Enjoy your active life while protecting your ring with our ring protector during workout, including running, weight lifting, yoga, cleaning Package Included: 4 Ring Protectors (Ring not included). Please feel free to contact us with any problems, we are willing to solve issue Ring Protector for Oura Ring 3 Compatibiliy Compatible with Oura Ring 3 Size Chart S for Ring Size 6/7 M for Ring Size 8/9 L for Ring Size 10/11 XL for Ring Size 12/13 Feature Soft silicone made Slim, soft and elastic to cover multi size Slide to install In the Pakcage 4Pcs Ring Protector