The X-20 is for your intermediate to high performance surfer and made for waves that are up to head high. This board was designed to be a high performance work horse for W.Q.S surfers that are not always surfing in perfect conditions. This translates to a great board for all surfers in most conditions. It has a flatter entry and exit rocker and a single concave combined with a wider outline in the middle to flow in all conditions. This board is a mandatory part of the quiver unless you live somewhere where the waves are perfect everyday.