Topsung Inflatable Arm Bands Floatation Sleeves Water Wings Swimming Arm Floats for Adults and Kids The design of hole is one-way inflatable to prevent air leak,if you want to vent the air, please hold the stomata. you can use pump to gasing expand or by your mouth.Please purchase from Topso to make sure the quality. Double airbag design,more safety,more comfortable and more buoyancy for floating,for weighing up to 220 pounds.Suitable for both kids and adults. Non-toxic environmental protection of PVC material,thickening made to long time use. The product suitable for both kids and adults,some customer feedback it is difficult roll-up to arm,maybe cause by gasing too much,suggestion 70% air enough,or you can trap to the arm frist,then gasing air to feeling comfortable. If you feeling too expand,please hold the stomate to vent few,it is adjustment as you feeling. Temperature is low in winter,PVC material easy become hard and crisp,Please put it in warm water about 15 minites before gasing air.Otherwise it is easy to cracking.