When picking out a swimming kickboard, there are several things to keep in mind. First, what size do you need? Kickboards usually come junior or adult sizes, but they are pretty much "one size fits all." Most kickboards are made of a buoyant foam and are typically not very expensive. These kickboards work fine and are the kind most people are familiar with, but they can cause shoulder pain with extended use. If this occurs, a swimmer can look for an "ergonomic" or "streamlined" kickboard. This style of kickboard are typically lighter and glide through the water easier. This allows them to put less strain on the swimmer's shoulders and be more comfortable for an extended amount of time.