The Ergoflex hand paddles from Aqua Sphere are a swim training tool used to increase the resistance in the water which will help to build up your upper body strength. The contoured fit mimics the correct hand position and flexes as you swim for a more natural stroke. The hand strap adjusts for a custom fit.
Maybe bad technique but paddles bend when swimming. Apart from that they work very well. Just ordered gloves to see the difference.