Learn to swim - Roll-up bracelets are perfect for building confidence in the water. Dual air chambers feature check wristbands safety valves with our Easy Inflate technology for faster inflation and deflation. Float roll up sleeves size: the size of the bracelets was 14 x 17 x 22 cm / 5.51 x 6.69 x 8.66 in before inflating, children could use it because the inner diameter could adjust the air that you are in bubbles. This is a universal style for children, only for the arms, not for legs and feet. And please note, you should use the bands Inflate size or it swimmers become uncomfortable. Safe triangular design: ergonomically designed, our swimming arm band adopts a triangular design that maximises stability and can effectively fix the swimming arm cuffs to prevent slipping. The air chambers on both sides increase the sense of safety and allow the baby to get used to the happiness that the swim bracelets bring with you. Premium and safe material: the safety of children is our top priority. Our inflatable armband is made of high-quality PVC material, which is skin-friendly, durable, odourless, smooth, burr-free, elastic and 0.2 mm thick to increase the grip. Safety embedded valve design prevents air leakage and is more convenient to use. Note: This is a swimming aid for learning to swim, not a life-saving tool for swimming. When used by children, please use it under adult supervision to ensure the safety of your children