1. Suitable users: It is recommended that infants aged 3 - 7 months and weighing 11 - 24 pounds use size S; infants aged 5 - 18 months and weighing 13 - 38 pounds use size L; children aged 1.5 - 6 years and weighing 28 - 48 pounds use size XL. Alternatively, you can contact us and we will recommend an appropriate size for your baby. 2. Design features: The baby swimming rings can provide an ideal swimming posture for babies, allowing them to easily learn to kick and swim in a horizontal position (instead of a vertical one). With a raised front and widened sides, it can help prevent flipping; there is a soft support at the bottom to help prevent the baby from slipping. 3. Portability: It is easy to inflate and deflate, convenient to carry and store, making it a good pool float for travel. 4. New version: It is suitable for swimming pools, bathtubs, and beaches. There are also baby pool floats with sunshades available. You may want to check out the new version. 5. Precautions: Each product has undergone air - tightness testing. Note that when inflating, it is advisable not to over - inflate (only inflate to 80% - 90%). If there is a problem with the product, please contact us.