Zoggs Hand Paddles are a great swim training aid for improving your stroke technique as they force your hand to stay straight as you pull through the water. They're also hydro-dynamically designed and feature a scooped front-end to catch the phase of your stroke with added holes to increase your feel of the water. Can be used on their own or with a pull buoy allowing you to focus solely improving your swimming stroke technique.  Zoggs Recommends...If you're considering training with hand paddles for the first time, you should always begin training with a smaller size (i.e. medium) regardless of the size of your hand