Swimming is a great way to stay fit and lose weight. If you do it seriously, you need to work on your technique. The FINIS Forearm Fulcrum is designed to help with that. It connects your forearm and hand, not allowing your wrist to bend. It helps you develop the correct stroke muscle memory and avoid putting unnecessary stress on your shoulder.
The device helps you develop Early Vertical Forearm and swim in a more efficient fashion. It is available in two sizes. More information is available here.