The Headstrong Posture Trainer uses range of motion to alert athletes of their head position. When properly attached, the device should be undetectable to the swimmer until he or she exceeds the recommended posture range. Head Strong™ is flexible and considered completely safe, but was designed to make contact with the lower portion of the neck when the swimmer's head position becomes problematic. This gentle contact alerts the athlete and aids in the correction of the problem. Head Strong's design enables it to be worn with or without a swim cap. It is fastened to the swimmer's head using a silicone band (supplied by Head Strong™). Swimmers also have the option of attaching it directly to their current goggle strap. It is quick and easy to install or remove, making transition between different sets simple.