Using this life jacket is straightforward. Just put it on like you would a regular vest and adjust the 2 - inch wide waist belt using the large slider for a comfortable fit. When in the water, it will automatically inflate via the CO2 cylinder if fully immersed. If you need to, you can also manually inflate it by pulling the 'Jerk to Inflate' cord or using the backup oral inflation tube. There's a zippered pocket where you can keep your phone, wallet, and keys. When you're done using it, repack the bladder in 4 easy steps. Here are some important notes. Always check the CO2 cylinder before each use to make sure it's working. Don't wear it if the cylinder is damaged or expired. Avoid sharp objects that could puncture the bladder. For maintenance, rinse it with fresh water after each use, especially if it was in saltwater. Let it dry in a cool, shaded area. Store it in a dry place when not in use. If you notice any signs of wear and tear, don't use it and contact the manufacturer.