In general, the tube is full when it is very firm. Covered tubes should be wrinkle free. An adult should be able to stand on the tube and only sink a couple of inches. In order to achieve this level of inflation, the PVC must stretch, which is why the choice of inflators is so important. It has to pump a high volume of air while having enough pressure to stretch the PVC. Again, very firm, wrinkle free, and you'll be riding high and having the time of your life!

It is important to monitor the amount of air in this product as heat will cause the bladder to expand, possibly causing damage to the seams or I-beams. If you leave a full tube sitting in the sun for any length of time, it will expand. Either store it in the shade, or let some air out. Don't let it sit on the beach, dock, or boat/watercraft full of air! At the same time, if it is stored out of the sun in a cool place, you may need to add air. Check and adjust inflation levels each time you use your tube. You'll have more fun, and your products will last longer.