【High-Quality Materials】These swim armbands are crafted from premium, non-toxic, and harmless materials, making them easy to inflate and deflate. They are the perfect tool for learning to swim, environmentally friendly, and reusable. 【Excellent Design】Featuring a double airbag design for enhanced safety, comfort, and swimming power. Arm circumference: 26-29cm; Recommended weight: 19-40kg; Suitable for children aged 3 to 14 years. Please measure your child's arm circumference before purchasing. 【Comfortable】These scratch-free swim floats are incredibly comfortable to wear, with soft, waterproof plastic fabric designed for your child's delicate skin. Available in Orange S (supports 12-40 kg), Orange L (ages 3-14, 38-80 kg), and Orange XL (suitable for adults 80 kg and over). 【Suitable for All Ages】While designed for children, these armbands can also be used by adults. First, put them on your arm, then inflate to your comfort level. If too tight, hold the valve to release some air until it feels right. Product Description: Material: Environmentally friendly PVC. Inner diameter: 12 cm. Outer diameter: 27 cm.