The Finis Bolster Paddles were developed in the USA, patented by a leading American swim coach.
The paddle covers both the hand and forearm and effectively locks the wrist while swimming to encourage the user to develop a forearm dominated stroke, and can be used for all four strokes.
Its unique design conforms more closely to the swimmers anatomy than any other paddle on the market when it comes to paddle blade, hand and forearm position when swimming.
The Bolster paddles can also be used with a pull buoy for a great upper body workout while improving skills at the same time. You could also try also using them in conjunction with a swimming snorkel, which will allow you to focus on your movements without having to turn your head to breathe.
Ideally, as with most training aids, try short distances with your Bolster paddles, especially initially, as this will help keep the focus on quality drills and performance, regardless of ability.